The invention relates to a drum brake. The drum brake comprises a brake drum with the annular cross section. The two sides of the interior of the brake drum are provided with brake shoes correspondingly. Each brake shoe is in hinge connection with the brake drum. A return spring is arranged between the brake shoes. A brake wheel cylinder is arranged between the brake shoes. The outer sidewall of each brake shoe is provided with a first brake friction plate and a second brake friction plate which are fixedly connected. The inner sidewall of the brake drum is provided with a wear-resisting layer. The service life of brake pads can be effectively prolonged under the action of the first brake friction plate and the second brake friction plate. Meanwhile, the wearing capacity of the brake drumcan be reduced through the wear-resisting layer, and the service life of the brake drum can be prolonged.