Liquefied petroleum gas cylinder valve with adjustable filling limiting device

The liquefied petroleum gas cylinder valve comprises a valve body, the lower end of the valve body is provided with the filling limiting device, the filling limiting device comprises a shell, a floating rod and a floater, the upper end of the shell is connected with the lower end of the valve body, and the lower end of the shell is connected with the floating rod. The telescopic pipe is inserted into the fixing pipe and matched with the fixing pipe in an up-down sliding mode, the connecting base is connected with the telescopic pipe and hinged to the lower end of the shell, the upper end of the telescopic pipe is fixed to the lower end of the connecting base, and the fixing pipe is sleeved with the floater. A long sliding hole extending vertically is formed in the right side of the fixing pipe, a plurality of clamping holes arranged vertically are formed in the right side of the telescopic pipe, the fixing pipe is sleeved with a key, the inner walls of the left end and the right end in the key are provided wi