Air-leakage prevention pressurizing device

The utility model discloses an air-leakage prevention pressurizing device which mainly comprises a rear cover, a front cover and a seal ring, and is characterized in that the rear cover comprises a left rear cover and a right rear cover which are arranged in a bilaterally symmetric manner; bolts with nuts are mounted in the middle grooves of the right rear cover and the left rear cover as well as the grooves in the two ends of the right rear cover through rotating shafts respectively; the right rear cover and the left rear cover are clamped in a groove of the left rear cover and fixed together through the bolts at the two ends of the right rear cover; the bolt between the right rear cover and the left rear cover is clamped in the groove of the front cover; the seal ring is padded in an annular groove between the front cover and the rear cover. According to the utility model, through the arrangement, an air feed pipe can be connected with a gas cylinder opening more tightly, so that the sealing performance of the air feed pipe and the gas cylinder opening is improved, and the air leakage can be effectively prevented; the structure is simple, the mounting and dismounting are convenient, the operation can be completed by a single person, the labor force is lowered, and the working efficiency is improved.