The invention discloses a no-power-stoppage conversion circuit breaker set sequential control method for 30-degree angular phase difference power distribution lines. Through selecting a standby circuit breaker, a remedial measure on the condition of action rejection of a loop closing circuit breaker or a loop unlinking circuit breaker is realized. Through a method of sequentially controlling the circuit breakers, high definiteness is realized. The no-power-stoppage conversion circuit breaker set sequential control method is suitable for a 30-degree angular phase difference power distribution line loop-closing or loop unlinking occasion in high-speed communication.