NOVELTY - A special acoustic device has acoustic reaction control system composed of power supply switch (1), temperature control reaction component (23), reaction time control part (5), ultrasonic output frequency section part (4), ultrasonic output frequency control part (3), and ultrasonic output power control part (24), acoustic reactor composed of feed hopper (15), shell layer (17), reactor acoustic window (12), temperature sensing component (14), heater pipeline (13), cooling water outlet (7), acoustic reaction acoustic energy control line (20), and cooling water inlet (22), and condenser (9).    USE - Special acoustic device for preparing biological diesel (claimed).    ADVANTAGE - The device is clean, sanitary, and convenient to clean, has moving parts, high safety, simple structure, and safe and controllable reaction, realizes non-inertial stirring, and reduces device corrosion.    DETAILED DESCRIPTION - A special acoustic device has acoustic reaction control system composed of power supply switch, temperature control reaction component, reaction time control part, ultrasonic output frequency section part, ultrasonic output frequency control part, and ultrasonic output power control part, acoustic reactor composed of feed hopper at left upper neck part of reactor, shell layer, reactor acoustic window, temperature sensing component, heater pipeline from upper and lower end connection of acoustic window to reactor body shell layer, cooling water outlet set at reactor body shoulder part, acoustic reaction acoustic energy control line set at reactor lower part, cooling water inlet set at lower part, acoustic material discharge opening (21) set at reactor lower part and shell layer, and reaction time connecting line (6) and ultrasonic output power control connecting wire (26) set at reactor back part, and condenser upper neck composed of condensed water inlet (8), condensed water outlet (10) set at upper part, and pressure meter (11) connected at upper end in which reactor shell body is 3-layer structure composed of inner layer which is reactant container layer, middle layer (18) set with sound collecting terminal device (19), and outer layer (25) which is cavity where cooling water inlet and outlet are connected, and condenser lower part is connected to acoustic reactor body shell layer.    DESCRIPTION OF DRAWING(S) - The drawing shows a structural schematic diagram of a special acoustic device for preparing biological diesel.    Power supply switch (1)    Ultrasonic output frequency control part (3)    Ultrasonic output frequency section part (4)    Reaction time control part (5)    Reaction time connecting line (6)    Cooling water outlet (7)    Condensed water inlet (8)    Condenser (9)    Condensed water outlet (10)    Pressure meter (11)    Reactor acoustic window (12)    Heater pipeline (13)    Temperature sensing component (14)    Feed hopper (15)    Shell layer (17)    Middle layer (18)    Sound collecting terminal device (19)    Acoustic reaction acoustic energy control line (20)    Acoustic material discharge opening (21)    Cooling water inlet (22)    Temperature control reaction component (23)    Ultrasonic output power control part (24)    Outer layer (25)    Ultrasonic output power control connecting wire (26)