The invention discloses an electronic brake system for lightweight electric vehicles. The electronic brake system comprises an electronic brake device, a wheel speed detection device and a brake switch which are connected with a brake controller; the electronic brake device at least composing of brake motors and brake pads is simple and convenient in overall structure, and the weight of the complete vehicle is favorably reduced; the wheel speed detection device comprises code wheels mounted on wheels; the brake switch is composed of angle transducers installed on brake handlebars. Breaking speed is determined by the brake controller according to the size of an angle numerical signal, and a corresponding control signal is output to the brake motors so that the brake motors can output suitable braking torque to control the brake pads to complete braking; meanwhile, the rotate speed of the wheels is detected in real time through the code wheels of the corresponding wheels, the braking torque of the wheels can be automatically adjusted through the brake controller according to the rotate speed, and constant braking of all the wheels is sustained; compared with a traditional manual brake system, the electronic brake system can effectively avoid side-turning hazards.