Standard bottle calibration equipment for water pressure test of gas cylinder by external measurement method

The invention belongs to the technical field of gas cylinder detection, and particularly relates to standard cylinder calibration equipment for a gas cylinder external measurement method hydrostatic test, which comprises a mounting frame, a first up-down movement mechanism, a second up-down movement mechanism, a water jacket group and a water jacket cover, the first up-and-down movement mechanism and the second up-and-down movement mechanism are both installed on the installation frame in a sliding mode. The water jacket cover is mounted on the first up-and-down movement mechanism and is used for being connected with a gas cylinder; the water jacket group comprises an upper water jacket and a lower water jacket which are coaxially arranged; the upper water jacket is mounted on the second up-and-down movement mechanism; the lower water jacket is positioned above the ground and is fixedly mounted on the ground; a sealing mechanism is arranged between the upper water jacket and the lower water jacket; when calib