High-pressure inflating device capable of eliminating axial resistance

A shell and a valve rod jointly form a front cavity, a middle cavity and a rear cavity, the middle cavity is communicated with the external atmosphere, the front cavity and the rear cavity are communicated with an external high-pressure gas source, the valve rod moves forwards to be matched with a valve element of a high-pressure gas cylinder to drive the valve element to rotate, and opening or closing of the valve element is achieved; when the valve element is opened, external gas enters the high-pressure gas cylinder through the external gas supply pressurizing pipe, the ventilation pipe, the front cavity and the ventilation connector in sequence. Through inflation and deflation tests of the gas cylinder, the axial resistance generated by the valve rod of the inflation assembly under the high-pressure effect can be eliminated, the operation difficulty of the high-pressure inflation assembly is reduced, the safety and reliability of the inflation device are improved, and the personal safety of inflation oper