The utility model discloses a braille display device driven by an electromagnetically-driven cam self-locking connecting rod. Wherein the contact pin display assembly is mainly composed of an electromagnetic driving mechanism, a cam self-locking mechanism, a connecting rod transmission mechanism, a shell and a pin cap; the electromagnetic driving mechanism is mounted at the bottom of the shell; the electromagnetic driving mechanism is connected with the connecting rod transmission mechanism through the cam self-locking mechanism, the connecting rod transmission mechanism is connected to the upper portion of the shell, the needle cap is connected to the connecting rod transmission mechanism, the upper end of the needle cap extends out of the shell, and the connecting rod transmission mechanism drives the needle cap to move up and down on the top face of the shell to form contact movement for braille display. Reset of the braille contacts is achieved, mechanical self-locking of the braille contacts can be formed through the cam type curved surface, continuous power supply is not needed, response time is short, power consumption is low, reliability is high, and refresh braille displaycan be achieved.