The invention belongs to the technical field of flywheel machining devices, and particularly relates to a rapid positioning device for magnetic steel of a magnetizing flywheel. The rapid positioning device for the magnetic steel of the magnetizing flywheel comprises a support, an annular ring, a positioning mechanism, a feeding mechanism and a power mechanism, the positioning mechanism comprises four clamping units, each clamping unit comprises an L-shaped pipe and an arc-shaped pipe, arc-shaped clamping blocks are slidably connected into the two sides of each arc-shaped pipe, the feeding mechanism comprises a main pipe and four feeding units, a piston is slidably connected into the main pipe, each feeding unit comprises a fixed cylinder and a movable column, a material suction part is arranged on one side of each moving column, the fixed cylinders communicate with the lower end of the main pipe, one ends of the L-shaped pipes of the four clamping units all communicate with the upper end of the main pipe, the L-shaped pipes, the main pipe and the fixed cylinders are filled with transmission fluid, and the power mechanism is used for driving the piston to slide along the main pipe. By using the device, positioning can be rapidly carried out on the magnetic steel, the four pieces of magnetic steel are uniformly distributed, and when the magnetic steel is subsequently fixed to the surface of the inner wall of the flywheel through the feeding mechanism, the pasting positions of the magnetic steel meet the requirement, and the machining precision is guaranteed.