The invention provides a miniature circuit breaker assembly detecting system. The system comprises an assembling table, an automatic code spraying unit, an automatic riveting unit, an on-off detecting unit, a time delay adjusting unit, an instant detecting unit, a voltage-resistance detecting unit, an automatic transfer printing unit, and a package assembling table which are sequentially connected with one another through transmission belts. Compared with the prior art, the miniature circuit breaker assembly detecting system uses an automation production detecting mode, enables the working efficiency of circuit breaker production to be greatly improved, meets the requirements of users, and has great significance on the circuit breaker production.