The invention discloses a connecting method of principal and subordinate circuit breakers in a power distribution cabinet and the power distribution cabinet. The method comprises: step 1, building hand-in-hand communication connection; step 2, carrying out serial numbering to multiple subordinate circuit breakers again by a host; step 3, carrying out the step of retrieval numbering, pairing one by one; and step 4, finishing the whole automatic retrieval numbering process, recovering to a normal mode.