The invention discloses a magnetic field measurement device of a magnetic resonance imaging superconducting magnet central area. The magnetic field measurement device comprises a magnetic measurement probe and an adjustment supporting frame. The adjustment supporting frame comprises an axial adjustment rod coaxially arranged with an inner barrel of a superconducting magnet, a radial supporting part used for the axial adjustment rod to be installed on and a height adjustment part arranged on the axial adjustment rod. The magnetic measurement probe can perform magnetic field measurement in any spatial direction through combined effect of the axial adjustment rod and the height adjustment part, and accordingly the adjustment capability of an adjustment device is expanded.