The invention discloses a mass center self-calibration inertial flywheel device, and relates to the technical field of experimental devices. Each cylindrical compression spring group is uniformly distributed at one end of the boss assembly in the circumferential direction, the outer side surface of the other end is circumferentially and uniformly provided with a plurality of groove upright posts,each support seat is arranged between each corresponding groove stand column and each corresponding cylindrical compression spring group, racks are fixedly arranged on the support base, gear assemblies are mounted on the support base, gears of the gear assemblies are respectively meshed with the racks, the boss assembly is in abutting fit with the mounting hole by means of each cylindrical compression spring set, a fixed flywheel disc rack is provided at the back of the fixed flywheel disc, and the fixed flywheel disc racks are respectively engaged with the gears. The fixed flywheel disc in rotation of the present invention can overcome the elastic force of the cylindrical compression spring in the corresponding direction to move along the axial direction of the positioning pin, the calibration of the position of the center of mass of the fixed flywheel disc is automatically realized, so that the center of mass of the fixed flywheel disc is collinear with the central axis of the rotating shaft, sliding and pulling the steel wire rope in the V-shaped groove by means of the sliding blocks, so as to adjust the rotational inertia of the fixed flywheel disc within a small range.