The utility model discloses a cylinder control brake mechanism, which comprises a brake cylinder, a connecting pin, a connecting steel structure and a brake block, wherein the brake cylinder consists of a cylinder barrel, a piston rod inside the cylinder barrel, and a return spring; the return spring is pressed against the upper end of the piston rod in the upper part of the cylinder barrel; the upper part of the connecting steel structure is connected with the cylinder barrel, and the lower part of the connecting steel structure is provided with a chute; the brake block can slide up and down in the chute; and the connecting pin is clamped in the brake block and is connected with the lower end of the piston rod. The cylinder control brake mechanism has the advantages that an oil inlet state of the brake cylinder can be controlled, so that the piston rod moves up and down, the connecting pin and the brake block are driven to move up and down, and the braking and unlocking functions are realized; the brake block can be detached and is conveniently and directly replaced after being worn, and the maintenance cost is low; and moreover, the cylinder control brake mechanism can be fixed on automobiles of different types and has high universality.