The invention provides a door brake and a cabinet, and belongs to the technical field of door-window connection. The door brake comprises a first sliding block, a second sliding block, a first brake block and a second brake block, wherein the first sliding block is slidably connected with the side face, provided with a cabinet door, of a cabinet body; the second sliding block is slidably connectedwith the cabinet door, and one end of the second sliding block is rotatably connected with one end of the first sliding block; the first brake block is fixedly connected to the first sliding block orthe second sliding block; and the second brake block is used for being in clamped connection with the first brake block, so that the first sliding block and the cabinet body are fixed relatively or the second sliding block and the cabinet door are fixed relatively. According to the door brake and the cabinet, the problems that the door cannot be fixed after being opened, the cabinet body and thecabinet door are prone to being damaged due to the fact that the brake is mounted at a hinge, and the occupied space is overlarge in the brake motion process are solved.