Anti-folding support of traction semitrailer

The invention discloses an anti-folding support of a traction semitrailer. The anti-folding support is connected between the back face of the tractor and the front end face of the semitrailer throughthe first base and the second base. One end of a supporting rod is connected to the first base, the other end of the supporting rod is connected with a tension and pressure sensor, the other end of the tension and pressure sensor is connected with a piston rod of a hydraulic rod, a cylinder body of the hydraulic rod is connected with the second base, the side face of the top end of the hydraulic rod is connected with a two-position two-way electromagnetic valve, and a spiral spring is arranged between the supporting rod and the first base. The semitrailer anti-folding support is connected between a tractor and a semitrailer in a bridging mode, can be suitable for various traction semitrailer types, can effectively prevent the traction semitrailer from being folded when the traction semitrailer runs at a high speed