The invention relates to a magnetic force operating mechanism used for a three-station isolation grounding switch, and aims to solve the problem that the magnetic force operating mechanism cannot satisfy the three-station operation requirement in the prior art. The magnetic force operating mechanism used for the three-station isolation grounding switch comprises a mechanism framework and a power output end assembled on the mechanism framework in a guiding and moving manner to be in transmission connection with a body moving end; fixed permanent magnets for forming magnetic field gaps, which extend in the moving direction of the power output end, are arranged in the mechanism framework; electromagnetic coils capable of moving in a reciprocating manner in the extension directions of the magnetic field gaps and connected with the power output end are arranged in the magnetic field gaps; each electromagnetic coil has a first extreme limit position and a second extreme limit position positioned at the two ends in the reciprocating moving travel, and also has a middle position positioned between the first extreme limit position and the second extreme limit position; and the magnetic force operating mechanism also comprises an elastic part for applying acting force to the electromagnetic coils and remaining the electromagnetic coils in the middle positions at the telescopic set length.