A mobile positioning device for an MRI inductively coupled coil, has at least one pair of coupled coils which are coupled with each other for transmitting signals, wherein one of the at least one pair of coupled coils is deployed on a surface of a patient's bed. A moveable platform is provided that can move in a direction parallel to the patient's bed, and the other one of the at least one pair of coupled coils is deployed on the moveable platform opposite to the coupled coil deployed on the patient's bed. The device can be driven by a motor or a spring. When the patient's bed needs to be placed at different positions for an examination, the coupled coil deployed on the moveable platform can be aligned completely and in parallel to the coupled coil fixed on the patient's bed by moving the moveable platform, so as to achieve the best coupling effects.