Vibration-reducing buffer gooseneck of semitrailer

The invention relates to a vibration-reducing buffer gooseneck of a semitrailer. The vibration-reducing buffer gooseneck comprises an upper vibration-reducing airbag bracket, a vibration-reducing airbag, a lower vibration-reducing airbag bracket, a hydro-pneumatic spring cylinder, an air discharge switch valve, a pneumatic depressurizing valve, an air charge switch valve, a longitudinal gooseneck beam, a rear gooseneck crossbeam and a front gooseneck crossbeam. According to the vibration-reducing buffer gooseneck of the semitrailer, the relative vertical vibration of a connecting part between a tractor and the gooseneck of the semitrailer can be effectively reduced, relative vibration between the tractor and the semitrailer in the driving direction can be reduced, the pressure and the height of the vibration-reducing airbag can be conveniently regulated, and the requirements of vehicles with different heights and different deadweights are met; under the working conditions of emergency brake, collision and the like of the vehicle, the hydro-pneumatic spring cylinder can be used for effectively reducing impact on the semitrailer, so that the safety of transported cargoes is guaranteed to the greatest extent.