Contactor control method and device, traction control system and train

The invention provides a contactor control method and device, a traction control system and a train. The control method of the contactor comprises the steps of: obtaining detection parameters, whereinthe detection parameters comprise the hard wire return detection signal of the to-be-detected contactor and any one or a combination of more of the following parameters: a voltage signal of an inverter, a current signal of the inverter and a disconnection identifier used for identifying disconnection of the contactor to be detected; determining the probability of abnormal disconnection of the to-be-detected contactor according to the detection parameters; and controlling the to-be-detected contactor and the motor contactor according to the probability. According to the contactor control method and device, the traction control system and the train, the credibility of state detection of the to-be-detected contactor is improved, and therefore control over the to-be-detected contactor and themotor contactor can be ac