NOVELTY - Portable multi-series fixed bed solid acid bio-diesel production equipment comprises methanol storage tanks I and II and an oil raw material storage tank (2). The oil raw material storage tank and the methanol tank II are respectively provided with pumps I and II and flow meters I and II connected to a static mixer I through a pipeline. The static mixer I, equipped with a heater I, is connected to the solid acid reactor I. The solid reactor I is connected to the separator I and connected to the middle tank I through its outlet. The static mixer II comprises a heater II.    USE - Used as a portable multi-series fixed bed solid acid bio-diesel production equipment.    ADVANTAGE - The device: is installed inside a movable room and hence is convenient for transport and handling; and is made of carbon steel and hence is economical.    DETAILED DESCRIPTION - Portable multi-series fixed bed solid acid bio-diesel production equipment comprises methanol storage tanks I and II and an oil raw material storage tank (2). The oil raw material storage tank and the methanol tank II are respectively provided with pumps I and II and flow meters I and II connected to a static mixer I through a pipeline. The static mixer I, equipped with a heater I, is connected to the solid acid reactor I. The solid reactor I is connected to the separator I and connected to the middle tank I through its outlet. The middle tank I and the methanol tank II, equipped with pumps IV and II and flow meters IV and III, respectively are connected to the static mixer II. The static mixer II is provided with a heater II of the solid acid reactor II. The solid reactor II is connected to the separator II. The separator II outlet is connected with the middle tank II. The middle tank II and the methanol tank II are equipped with pumps V and II and flow meters VI and V, respectively and are connected to a static mixer III. The static mixer III, provided with a heater III, is connected to a solid acid reactor III. The solid acid reactor III is connected to the separator III. The separator III outlet is connected to the middle tank III. The middle tank III and the methanol tank I are equipped with pumps VI and III and flow meters VIII and VII, respectively and are connected to the static mixer IV. The static mixer IV is provided with a heater IV and is connected to the solid acid reactor IV. The solid acid reactor IV is connected to the separator IV. The separator IV outlet is connected to the lower end of the middle tank IV. The middle tank IV and the methanol tank I are equipped with pumps VII and III and flow meters X and IX, respectively and are connected to the static mixer V. The static mixer V provided with a heater V is connected to the solid acid reactor V. The solid acid reactor V is connected to the separator V. The separator V outlet is connected to the lower end of the middle tank V. The middle tank V and the methanol tank I are equipped with pumps VIII and III and flow meters XII and XI, respectively and are connected to a static mixer VI. The static mixer VI, equipped with a heater VI is connected to solid acid reactor VI. The solid acid reactor VI is connected to the separator VI. The separator VI outlet is connected to the lower end of the middle tank VI. The middle tank VI, equipped with pump IX, flow meter XIII and a heater VII is connected to the first falling-film evaporator. The first falling-film evaporator central outlet is connected to the first condenser, connected to a vacuum tank I. The upper end of the vacuum tank I is connected to the vacuum pump I and its bottom is connected to the middle tank VIII. The middle tank VIII and the upper outlet of separator IV, V and VI are connected to methanol tank II through a piping pump X. The first falling-film evaporator is connected to the lower end of the middle tank VII. The middle tank VII, equipped with a pump XVI and a flow meter XVI is connected to the first decolorizing device. The first decolorizing device equipped with a pump XVII and a flow meter XVII is connected to the second decolorizing device. The second decolorizing device equipped with the pump XVIII and a flow meter XVIII in the pipeline is connected to a bag-type filter (16). The lower end outlet of separators I, II and III are connected to the middle tank IX through three direct links. The middle tank IX through a pump is connected to the top of the second falling-film evaporator through a pipeline. The second falling-film evaporator outlet is connected to the second condenser. The second condenser is connected to a vacuum tank II. The upper end of the vacuum tank II is connected to the vacuum pump II and its bottom to a middle tank XI. The middle tank XI equipped with a pump XIII and a flow meter XV is connected to a methanol recovery tower (14), connected to a third condenser. The third condenser is connected to a vacuum tank III. The lower end of the vacuum tank III equipped with pump XIV and flow meter XVI is connected to the methanol recovery tower (14). The middle of the vacuum tank III is connected to the middle tank XII, which is connected to the methanol tank I through a pump XV. The above equipment is installed inside a movable room convenient for transport.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the portable multi-series fixed bed solid acid bio-diesel production equipment.    Oil raw material storage tank (2)    Methanol recovery tower (14)    Bag-type filter (16)