Multi-stage gas compression device

The utility model provides a gas multi-stage compression device which comprises a first cylinder head, a second cylinder head, a third cylinder head and a fourth cylinder head. The air cylinders are used for compressing low-pressure gas step by step, the air cylinders are connected in series in an on-off mode, and the air cylinders are oppositely arranged; the low-pressure air inlet communicates with the first-stage air cylinder, and the last-stage air cylinder is connected with the high-pressure exhaust port in an on-off mode. The crankcase is located between the air cylinders which are oppositely arranged and used for fixing the air cylinders, a rotatable crankshaft is installed in the crankcase, and rockers hinged to pistons of the air cylinders are installed on all stages of shaft necks of the crankshaft in a sleeved mode and used for alternately compressing gas in the air cylinders. According to the utility model, the canning capacity of gas can be improved. 本实用新型提供一种气体多级压缩装置，包括：第一缸头，所述第一缸头内设置低压进气口和高压排气口