The embodiment of the invention discloses a positioning method, device and system of a local coil of a magnetic resonance device. The positioning method includes the following steps that: an induced electromotive force on an induction coil when the local coil moves in a gradient magnetic field of the magnetic resonance device is measured, wherein the induction coil is arranged at a relatively fixed position of the local coil; and the induction coil is positioned in the gradient magnetic field according to the gradient switching rage of the gradient magnetic field, the effective induction area of the induction coil and the induced electromotive force, and the local coil is positioned based on the positioning result of the induction coil. With the positioning method, device and system of the local coil of the magnetic resonance device of the invention adopted, the local coil can be positioned without laser marking required, and a coil positioning process can be simplified; and positioning can be realized when a bed plate enters a magnetic field without extra measurement time required; the effective induction area of the induction coil can be measured, so that the shape, position and generation process of the induction coil can be designed flexibly.