PURPOSE: A fluid pump is provided, in which automatic fluid pump has an air groove formed inside of the pump, to thereby prevent fluid from being dropped along the suction pipe during pumping or upon occurrence of overflow. CONSTITUTION: A fluid pump(100) comprises a body unit having a suction pipe(20) mounted at the front end of the body unit, a battery mounting section(50) for accommodation of a battery(B), and an outlet port(11), such that the fluid is sucked from a container through the suction force generated from the rotation of a suction fan driven by a motor, and discharged through the outlet port; a suction and pumping unit arranged within the body unit, and which rotates the suction fan installed within the suction pipe by driving the motor, and sucks the fluid into the body unit; and a fluid discharge unit(40) arranged at a side of the suction pipe so as to smoothly discharge the fluid upon occurrence of overflow or when the fluid remains after completion of operation of the suction and pumping unit. The fluid discharge unit includes a contact surface(17) formed at the upper portion of an inlet opening(16), and a protrusion(22) formed at the top of the suction pipe. The inlet opening has a clearance(19) formed at the center of the inlet opening. The outlet port of the body unit has an air groove(13) formed at a transverse direction, and fluid outlet groove(15) are formed at both sides of the air groove so as to discharge fluid upon occurrence of overflow. An air supply space(18) is formed onto the fluid outlet groove.