The DePai lubriline pneumatic plunger pump is a unidirectional working pump or a double-acting reciprocating pump, designed for single-component materials with viscosities ranging from NLGI 0 to NLGI 3, such as lubricants, oils, adhesives, sealants, etc., and can be directly output from raw material drums. The DePai pneumatic plunger pump is suitable for centralized oil supply or single-station supply. The DePai pneumatic plunger pump features a modular design, is robust and durable, and is easy to maintain and service.