Peristaltic pump capable of prolonging service life of delivery pump pipe

The invention discloses a peristaltic pump capable of prolonging the service life of a conveying pump pipe, and relates to the technical field of pumps. The at least one extrusion piece is arranged on the connecting piece, and the extrusion piece is movably connected with the connecting piece; at least one elastic piece for resetting the extrusion piece is arranged on the extrusion piece; the extrusion part is composed of a C-shaped limiting plate and a pressing roller connected to the limiting plate through a shaft. When the peristaltic pump is applied to water quality sampling equipment to collect a water sample of a polluted water body, the water sample with various impurities, such as stones mixed in water, possibly flows in the pump pipe, the impurities can enlarge the volume of the pump pipe, and when the volume of the pump pipe is increased due to the impurities, the rotating diameter and the extrusion distance can be changed, so that the water sample can be collected. The pump pipe with the adjustable