The invention relates to a method for generating electromagnetic force with temporal and spatial variation in a conducting liquid by adopting fluid driving, and belongs to the technical field of electromagnetic metallurgy, preparation of semiconductor materials, chemical industry and glass industry. The method comprises the following steps: firstly, a cylindrical cavity body is formed in a conducting liquid, wherein the cavity body is provided with a driving fluid channel port, a turbine blade is arranged in the cylindrical cavity body, and a permanent magnet and the turbine blade are fixed oppositely; the driving fluid enters or flows out from a channel port of the cavity body according to the cycle P, drives the turbine blade to rotate forward or backward according to the cycle P, and drives the permanent magnet to rotate, and a rotary magnetic field for cyclic variation in direction is generated; and eddy current is generated in the conducting liquid at the periphery outside the cavity body, the rotary magnetic field and the eddy current interact, and the electromagnetic force is generated so as to drive or stir the conducting liquid. An electromagnetic driver formed by adopting the method provided by the invention can be used in a metal condensation process to improve macrosegregation, a metal alloying process as well as the field for preparing gradient materials, composite materials and the like.