The invention discloses a fluid pump and a method for delivery fluid. The fluid pump comprises a tubular pump body and a piston. The piston is positioned in the tubular pump body; the piston comprises piston bodies, piston through holes and valves; the piston can reciprocate in the tubular pump body. The piston can be driven by electromagnetic force or crank connecting rods or telescopic rods or linear motors to reciprocate, and the telescopic rods are electrostriction rods or magnetostriction rods. The fluid pump and the method have the advantages that the fluid pump and the method are used for delivering the fluid, the fluid can be driven by high-frequency reciprocation, accordingly, fluid and machine coupling modes can be changed, the piston bodies and the valves are integrated with one another, driving structures can be simplified, and the volume of the pump can be reduced.