PURPOSE: To improve self-priming liquid suction pump head and prevent the pulsation of liquid in a liquid suction hose by providing a check valve allowing the unidirectional flow of liquid from the liquid suction hose to a liquid storage container, and an opening/closing cover provided at the upper part of the liquid storage container so as to be able to close in the airtight-watertight state while enabling priming.
CONSTITUTION: A first opening 5 provided near the bottom part of a liquid storage container 4 is communicated with the suction port 2 of a pump through a pump connecting joint 3. The upper part of the liquid storage container 4 is provided with a liquid supply port 6. The liquid supply port 6 is crowned with an opening/closing cover 8 in the airtight-watertight state through packing 7. A recession 18 is formed at the bottom part center and closed by a closable cover 20. A second opening 9 is provided with a check valve 15 for making this opening closable and allowing the unidirectional flow of liquid from a liquid suction hose 12 to the liquid storage container 4.