The invention discloses a circuit integrated chip for a vehicle generator, comprising a rectifying unit and a voltage regulating unit, wherein the rectifying unit is provided with a metal-oxide-semiconductor field effect transistor (MOSFET), a rectifying power module, a rectifying control circuit, an input end and an output end; the input end is connected to a stator coil of the generator and used for converting alternating current into direct current and outputting the direct current from the output end; the voltage regulating unit is provided with a control circuit and a power module; and the power module of the voltage regulating unit is electrically connected to a rotor coil of the generator so as to regulate the output voltage value of the generator.