The invention discloses an inverter control circuit for driving an AC synchronous motor. A system comprises the AC synchronous motor and the inverter control circuit which is connected with the AC synchronous motor. The inverter control circuit comprises the components of a rectifying and voltage-stabilizing circuit, a microcontroller circuit which is connected with the rectifying and voltage-stabilizing circuit, a power device driving circuit which is connected with the output end of the microcontroller circuit, and a power output circuit which is connected with the output end of the power device driving circuit, wherein the power output circuit is connected with the AC synchronous motor. The inverter control circuit has advantages of simple structure, wide integral application range to an external power supply voltage, great application range extension, high output voltage precision, high output voltage stability, and small number of used components. Therefore manufacture cost of the inverter control circuit can be greatly reduced. Furthermore the inverter control circuit has strong applicability and high practicability.