NOVELTY - Crude methyl ester washing equipment for producing biodiesel comprises a raw material heater (1), a continuous washing tower (2), a metal salt hot water tank (3) and a vacuum distillation tower (4). The raw material heater is a sealed hollow structure, which is equipped with an inlet and an outlet. The metal salt hot water tank is a circular or rectangular container, and contains at least one outlet located at the lower part of the container. The continuous washing tower and a tower body possess a hollow cylindrical structure. The tower body bottom is equipped with a waste acid outlet.    USE - The device is useful for producing biodiesel.    ADVANTAGE - The device comprises a selection plate for continuous washing, which controls suitable flow speed, and mixes specific amount of oil with water having a specific temperature, and adds specific amount of metal salt into washing water, thus ensuring continuous washing effect and saving investment with continuous production of product.    DETAILED DESCRIPTION - Crude methyl ester washing equipment for producing biodiesel comprises a raw material heater (1), a continuous washing tower (2), a metal salt hot water tank (3) and a vacuum distillation tower (4). The raw material heater is a sealed hollow structure, which is equipped with an inlet and an outlet. The metal salt hot water tank is a circular or rectangular container, and contains at least one outlet located at the lower part of the container. The continuous washing tower and a tower body possess a hollow cylindrical structure. The tower body bottom is equipped with a waste acid outlet, which is set at the lower part of crude methyl ester inlet by a metal pipeline, metal flange and raw material heater outlet. The raw material heater upper part has a water inlet, and is further fixedly connected with the metal salt hot water tank outlet by the metal pipeline and metal flange. The metal salt hot water tank is fixedly connected with an upper part of a methyl ester washing outlet by the pipeline, metal flange and vacuum distillation tower head. The vacuum distillation tower is a cylindrical structure, where the middle part of the tower is provided with an acid outlet. The vacuum distillation tower upper part is connected with a refined methyl ester pipeline, and the lower part is connected with the product pipeline. The raw material heater, continuous washing tower, the metal salt hot water tank and vacuum distillation tower are respectively connected with an instrument control system.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the crude methyl ester washing equipment for producing biodiesel.    Raw material heater (1)    Continuous washing tower (2)    Metal salt hot water tank (3)    Vacuum distillation tower (4)