NOVELTY - The system device includes a water storage tank (1), a base storage tank (2), a reaction kettle body (8), an A-type additive storage tank (14), a B-type additive storage tank (12), a product oil storage tank (23), and a control device (24). The upper section of reaction kettle body is connected to the B-type additive storage tank by a B-type additive flow meter (10), a B-type additive pump (13), and a B-type additive solenoid valve (11). A stirrer (27) is mounted at bottom of the reaction kettle body, and is connected to a stirrer driving motor (28) by connecting shaft.    USE - System device for synthesizing biodiesel by small-scale production.    ADVANTAGE - Provides an environment-friendly system device that saves petroleum resource and reduces the discharge of pollution.    DETAILED DESCRIPTION - The upper portion of the reaction kettle body is also connected to the A-type additive storage tank by A-type additive flow meter (21), A-type additive pump (18) and A-type additive solenoid valve (15). The middle portion of reaction kettle body is connected to the water storage tank by a water solenoid valve (3), water flow meter (32) and water pump (34), and is connected to the base oil storage tank by a base oil solenoid valve (4), a base oil flow meter (30) and a base oil pump (31). The lower portion of reaction kettle body is connected to the product oil storage tank by a product oil pump (26) and a product oil solenoid valve (19).    DESCRIPTION OF DRAWING(S) - The drawing is a schematic illustration showing the structure of the system device for synthesizing biodiesel.    Water storage tank (1)    Base storage tank (2)    Water solenoid valve (3)    Base oil solenoid valve (4)    Reaction kettle body (8)    B-type additive flow meter (10)    B-type additive solenoid valve (11)    B-type additive storage tank (12)    B-type additive pump (13)    A-type additive storage tank (14)    A-type additive solenoid valve (15)    A-type additive pump (18)    Product oil solenoid valve (19)    A-type additive flow meter (21)    Product oil storage tank (23)    Control device (24)    Product oil pump (26)    Stirrer (27)    Stirrer driving motor (28)    Base oil flow meter (30)    Base oil pump (31)    Water flow meter (32)    Water pump (34)