The invention provides a drawbar connecting device which comprises a drawbar coupling installed on a traction vehicle and a drawbar suspension loop installed on a trailer. The drawbar coupling is connected with the drawbar suspension loop in a spherically-hinged mode. A spherically-hinged structure can realize that enough pivot angles exist in all directions of the drawbar suspension loop, the spherically-hinged fit enables the vehicle to operate more stably and the spherically-hinged portions are unlikely to wear, so that the service life is prolonged on the basis of ensuring the travelling safety. The spherically-hinged design of the drawbar coupling and the drawbar suspension loop realizes various angle ranges. The pivot angle design conforms to requirements in the new standard 'Road vehicles - Drawbar couplings - Interchangeability' and guarantees the vehicle safety in the driving process of the vehicle when the vehicle turns or goes up and down a slope or has an accident or the like, thereby assuring personal and property safety.