Abstract: A portable pump by which liquid may be horizontally pressed out, comprising a liquid storage container, a pump head being provided at a side of the liquid storage container, and a liquid suction device that is connected to the pump head being provided within the liquid storage container. The liquid suction device comprises a liquid suction chamber, a spring, a piston, and a liquid outlet pipe that is connected to the pump head. The liquid suction chamber is provided with a liquid inlet pipe and a fixed end of the spring, check valves being provided within the liquid outlet pipe and the liquid inlet pipe. The piston is sleeved with the liquid outlet pipe and provided with a through hole that matches an opening of the liquid outlet pipe. The pump can comprise a locking seat on the side of the liquid storage container that matches a pump head cover.