NOVELTY - Processing device comprises reaction tank (1); circulation pipeline (5); light phase circulation outlet (1-3); heavy phase circulation outlet (1-4); light phase and heavy phase mixing circulation inlet (1-5); recycling pump (2); hydrodynamic cavitation device (3); pipeline valve; calandria liquid distributor (1-6) connected to light phase and heavy phase mixing circulation inlet; U-shaped tubular heater (1-7) embedded between calandria liquid distributor and heavy phase circulation inlet.    USE - Processing device used for esterification and ester exchange reaction of biodiesel oil.    ADVANTAGE - The processing device has simple structure, reasonable design, low energy consumption, reduces production cost, and conducive to engineering applications.    DETAILED DESCRIPTION - Processing device comprises reaction tank (1); circulation pipeline (5) for reaction material connected to reaction tank; light phase circulation outlet (1-3) arranged at upper end of reaction tank shell; heavy phase circulation outlet (1-4) arranged at lower end of reaction tank shell; light phase and heavy phase mixing circulation inlet (1-5) arranged on reaction tank shell between light phase circulation outlet and heavy phase circulation outlet, in which light phase circulation outlet and heavy phase circulation outlet are separately connected to circulation pipeline and connected to light phase and heavy phase mixing circulation inlet by circulation pipeline; recycling pump (2); hydrodynamic cavitation device (3); pipeline valve; calandria liquid distributor (1-6) connected to light phase and heavy phase mixing circulation inlet; U-shaped tubular heater (1-7) embedded between calandria liquid distributor and heavy phase circulation inlet. The calandria liquid distributor comprises distributor main pipe and distributor branch pipe provided with distributor branch pipe distribution holes. The shell top of reaction tank is provided with air vent and manhole. The recycling pump adopts centrifugal pump with lift of 30-50 meters.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of processing device.    Reaction tank (1)    Light phase circulation outlet (1-3)    Heavy phase circulation outlet (1-4)    Mixing circulation inlet (1-5)    Calandria liquid distributor (1-6)    Heater (1-7)    Recycling pump (2)    Hydrodynamic cavitation device (3)    Circulation pipeline (5)