The invention discloses a self-hold brake device. The device comprises a shell; one side of the shell is opened; a cover plate for covering the opening is mounted in the opening; a rotating shaft cavity and a slide base cavity for communicating with each other are formed in the shell; a rotating shaft out of the shell is inserted in the rotating shaft cavity, and can freely rotate in the rotating shaft cavity; the slide base cavity communicates to the opening of the shell; a slide base capable of sliding in the slide base cavity is arranged in the slide base cavity; and spring cavities are respectively formed in two sides of the slide base. The self-hold brake device is respectively provided with the spring cavities, with springs inside, on two sides of the slide base; when a cam rotates to enable a projection part thereof to not butt again a cam groove, under the effect of elastic force of the springs in the spring cavities, a projection on a slide tongue of the slide base is contacted with the rotating shaft without rotating to realize braking of the rotating shaft; and at this time, the elastic force of the springs can always keep the contact between the projection on the slide tongue of the slide base and the rotating shaft without rotating to realize a self-hold brake state without consuming the energy.