The pumping principle of peristaltic pump is to pass through the high elastic and corrosion-resistant polyurethane hose of pump body and form a part of vacuum at the suction end of the hose under the action of rotating extrusion. The fluid is sucked into the hose, and under the action of rotating extrusion, the fluid is squeezed to the discharge end of the hose, thus achieving the purpose of pumping the fluid.