The invention discloses a braking device, which comprises a fixed iron core, a braking element, a coil and a compression spring, wherein the braking element comprises a friction plate and a movable element; the friction plate is fixedly connected with the side part of the movable element; the upper and lower end faces of the movable element are matched with the fixed element matching surfaces of the upper and lower end faces of the movable element, so that braking friction force is transmitted to a fixed element; the braking friction force of the friction plate passes through the upper end face or the lower end face of the movable element. The braking device has the advantages of compact and simple structure, reasonable stress of the braking element, reliable movement, long service life, simple structure, convenience in installing and easiness in repairing.