The invention relates to the technical field of a low-voltage circuit breaker, and in particular to an intelligent low-voltage circuit breaker and an arc extinguishing chamber thereof. The intelligent low-voltage circuit breaker comprises a circuit breaker body, wherein the circuit breaker body comprises an operating mechanism, a contact assembly, a current transformer, a magnetic flux switch and an arc extinguishing chamber which are arranged in a plastic shell, and an intelligent module is further arranged in the plastic shell. By the intelligent low-voltage circuit breaker, the functions of remote inquiry and intelligent monitoring are achieved, moreover, the arc extinguishing speed is greatly increased, and the safety is improved. The arc extinguishing chamber of the circuit breaker can be used for playing a role in arc isolation, secondary breakdown is prevented, moreover, the arc extinguishing chamber has a guide effect on arc striking, so that an arc rapidly moves and is stretched, the arc striking time is shorter, the circuit breaker has better breaking capability, and the arc is favorably and rapidly extinguished.