Parking brake of large loader

The invention relates to the technical field of parking brakes and provides a parking brake of a loader. The parking brake comprises a brake disc, and a brake body is arranged on the upper portion ofthe brake disc. The parking brake is characterized in that the brake body comprises brackets which are located on the two sides of the brake disc and can move relatively, and the brackets on the two sides can move forwards and backwards through a sliding shaft; friction plates in separable contact with the brake disc are arranged on the inner sides of the brackets; a handle connected with a hand brake steel wire is arranged in the middle of the brake body, and the handle and the brake body are rotatably connected; and a cam mechanism capable of driving the bracket on the same side to move is arranged between the handle and the bracket. The hand brake steel wire is connected onto the handle of the parking brake, by tightening the steel wire, the handle makes lever principle movement to drive a cam on the brake body