NOVELTY - Device comprises a methanol storage tank, a methanol vaporizer, a gas-liquid separator, a heat exchanger, a catering waste oil storage tank, a catalyst storage tank, an esterification reactor, a conveying pump, a precipitation tank, a centrifuge, a water washing tank, a vacuum drying device, a distillation tower, a condenser, an oil water separator and a biodiesel oil tank. The methanol storage tank is connected with the inlet of methanol vaporizer via pipeline. The methanol vaporizer is connected to the lower inlet of esterification reactor via gas-liquid separator.    USE - The device is useful for producing biodiesel using waste catering oil (claimed).    ADVANTAGE - The device converts food waste oil into biodiesel to achieve reuse of resources.    DETAILED DESCRIPTION - Device comprises a methanol storage tank, a methanol vaporizer, a gas-liquid separator, a heat exchanger, a catering waste oil storage tank, a catalyst storage tank, an esterification reactor, a conveying pump, a precipitation tank, a centrifuge, a water washing tank, a vacuum drying device, a distillation tower, a condenser, an oil water separator and a biodiesel oil tank. The methanol storage tank is connected with the inlet of methanol vaporizer via pipeline. The methanol vaporizer is connected to the lower inlet of esterification reactor via gas-liquid separator. The catering waste oil storage tank and the catalyst storage tank are connected to the upper inlet of esterification reactor. The upper outlet of the esterification reactor is connected to the methanol storage tank via heat exchanger. The lower end of the esterification reactor outlet is connected to the precipitation tank inlet by a conveying pump. The precipitation tank outlet is respectively connected to the centrifuge, the water washing tank inlet and the esterification reactor upper inlet. The centrifuge outlet is connected the biodiesel oil tank. The water tank inlet is connected is connected to the hot water tank and vacuum drying device outlet. The vacuum drying device outlet is connected to the distillation tower inlet. The distillation tower outlet is connected to the oil-water separator through the condenser. The upper end of the oil-water separator is connected to the vacuum pump via buffer tank. The oil-water separator is connected to the bottom of biodiesel oil tank.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic representation of the device for producing biodiesel using waste catering oil.