The invention discloses a magnetic field interaction device of a magnetic resonance physiotherapy instrument. The magnetic field interaction device includes a pedestal, a strong magnetic ring and an inductor, the top of the pedestal is provided with a physiotherapy couch main couch body, the top of the physiotherapy couch main couch body is provided with a couch plate, the joint of the pedestal and the physiotherapy couch main couch body is provided with a sliding rail, one side of an end part of the sliding rail is provided with a drive motor, the top of the sliding rail is provided with a magnetic ring fixing plate, the magnetic ring fixing plate is slidably connected with the sliding rail, the top of the magnetic ring fixing plate is provided with a rotary magnetic disc motor, an end part of an output shaft of the rotary magnetic disc motor is connected with a rotary magnetic disc, one side of the rotary magnetic disc is provided with the strong magnetic ring, a first sliding grooveis arranged between the physiotherapy couch main couch body and the couch plate, and the strong magnetic ring is arranged inside the first sliding groove and is movably connected with the first sliding groove. The magnetic field interaction device of the magnetic resonance physiotherapy instrument enhances magnetic field resonance through a rotary magnetic field technology, so that multielement magnetic field adjustment enables the physiotherapy position of a magnetic resonance physiotherapy instrument user to be finer and effects are better.