NOVELTY - Device for producing bio-diesel comprises a raw material pre-processing tank (1), a reactor (3), a methanol recovery tower (5), a water washing tower (7), a vacuum distillation tower (9), a feeding pump A, a feeding pump B, a feeding pump C and a feeding pump D. The raw material preprocessing tank is a square groove structure. The upper part at one side of the tank is fixed with a metal tube, where one end of the tank is embedded with the metal, and the other end is connected with the feeding pump A. The feeding pump A is connected to the inlet of the raw material pre-processing tank.    USE - The device is useful for producing bio-diesel.    ADVANTAGE - The device: prevents the problem of low-quality kitchen waste, water content of swill oil containing impurities and delayed reaction layering; has a short production cycle; and improves the yield of product.    DETAILED DESCRIPTION - Device for producing bio-diesel comprises a raw material pre-processing tank (1), a reactor (3), a methanol recovery tower (5), a water washing tower (7), a vacuum distillation tower (9), a feeding pump A, a feeding pump B, a feeding pump C and a feeding pump D. The raw material preprocessing tank is a square groove structure. The upper part at one side of the tank is fixed with a metal tube, where one end of the tank is embedded with the metal, and the other end is connected with the feeding pump A. The feeding pump A is connected to the inlet of the raw material pre-processing tank. The bottom of the groove is provided with a continuously arranged U shaped heating coil. The two ends of the heating coil pipe extend out of the groove, where one end is provided with a heat transfer medium inlet, and the other end is provided with a heating medium outlet. The raw material preprocessing tank with the groove body is set with at least one drain impurity outlet. The reactor is a vertical hollow cylindrical structure, where the upper part is provided with an oil inlet, a crude outlet, a crude methanol outlet, and a methanol inlet. The oil inlet is made of metal pipe, and is connected to the outlet of the feeding pump A. The crude outlet is made of metal pipe, and is connected to the outlet of the feeding pump C. The crude methanol outlet is connected to the feeding pump B. The methanol inlet is connected to the methanol recovery tower. The methanol recovery tower is a vertical cylinder structure, whose inner cavity is vertical to the vertical tower axis, which is parallel to each other and are uniformly distributed on 5-15 metal sieve tray. The metal sieve plate tower disc is provided with uniformly distributed multiple holes. The vertical tower body in the middle of the feed interface is connected with the feeding pump B through a metal tube. The bottom of the vertical tower body opening is fitted with a metal ball valve outlet. The water washing tower is a vertical hollow cylinder structure. The upper part of the vertical side wall of the tower body is provided with an interface. The vertical lower side wall of the tower body is connected with the feeding pump C through the metal tube. The feeding pump D is connected with the inlet of the vertical tower body. The inlet of the vertical tower body is provided with a sewage outlet. The vertical tower body is opened with the water inlet. The vacuum distillation tower is a vertical cylinder structure. The lower side wall of the vertical tower body is connected with the feed pump D through the metal pipe. The upper part of the side wall of the vertical column is opened to qualified biodiesel. The vertical tower body is opened with a vacuum port, and is connected to a vacuum system. The bottom of the vertical tower comprises an open plant asphalt outlet. The vacuum distillation tower is provided with metal fillers, the raw material pre-treatment tank, the reactor, the methanol recovery tower, the water washing tower, the vacuum distillation tower, the feeding pump A, the material pump B, the material pump C, and the feeding pump D are connected to the electrical and instrumentation control system, between all devices and pipelines.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the device for producing bio-diesel.    Raw material pre-processing tank (1)    Reactor (3)    Methanol recovery tower (5)    Water washing tower (7)    Vacuum distillation tower (9)