The invention provides a communication circuit for an electric vehicle based on a CAN bus. The communication circuit comprises a CAN receiving and sending device and a signal control circuit electrically connected with the CAN receiving and sending device. The CAN receiving and sending device is used for transmitting communication data between a master control unit and an auxiliary control unit of a vehicle control unit of the electric vehicle. The signal control unit is used for carrying out rectifier filtering on the communication data and filtering interference signals in the communication data out. The CAN receiving and sending device at least comprises a first CAN receiving and sending device without a wakeup function and a second CAN receiving and sending device with a wakeup function, and the first CAN receiving and sending device and the second CAN receiving and sending device are respectively connected with the signal control circuit. According to the technical scheme, strong expandability is achieved, and the communication requirements for high strength and high complexity of the electric vehicle can be met.