The driver drives the crankshaft after speed reduction and torque increase in the reducing mechanism, the crank connecting rod mechanism converts rotary motion of crankshaft to reciprocating motion of piston, which pushes hydraulic oil in hydraulic chamber. Hydraulic oil transmits piston thrust force and volumetric change, acting on hose diaphragm. Hose diaphragm is subject to cyclical squeezing under force transmitted by hydraulic oil, leading to cyclical compression and relaxation of internal fluid chamber in hose diaphragm, thus producing volumetric change. Continuous fluid delivery is realized under combined action of inlet and outlet check valve assemblies.