The present invention relates to a low-voltage circuit breaker with convenient discrimination and operation. The low-voltage circuit breaker comprises a bottom plate and a plurality of circuit breakers arranged in parallel on the bottom plate. The bottom plate is provided with transparent shells with the same number of the circuit breakers. The transparent shells are corresponding to the circuit breakers one by one and are arranged side by side. The lower parts of the transparent shells are provided with identification cards corresponding to connected circuits. The upper ends of the transparent shells are hinged to the bottom plate, and the lower ends of the transparent shells have bar-shaped convex blocks that facilitate the upturn of the transparent shells. Through installing the transparent shells corresponding to the circuit breakers and inserting the identification cards which are made of fluorescent material and mark corresponding circuits in panels of the transparent shells, when a circuit failure occurs, through a circuit name displayed in an identification card, a corresponding transparent shell can be conveniently opened to restore a circuit breaker.