The invention discloses a phase sequence self-adaptive control system and method for three-phase full-control rectifier bridge thyristor trigger pulses. The method comprises steps: the phase sequenceof a three-phase AC power supply of a rectifier bridge is measured; if a negative sequence exists and is confirmed by a user, trigger pulses outputted by an excitation system are adjusted in real timeaccording to the phase sequence of the AC power supply, and thus, correct output of the three-phase full-control rectifier bridge is ensured, and an AC power supply incoming line does not need to beadjusted. The problem that the excitation system cannot operate normally due to a copper bar design error or a manual wiring error in the debugging and maintenance process can be solved. The control logic of the trigger pulses of the excitation regulator is perfected, the redundant fault-tolerant capability of the excitation system is improved, and the field debugging efficiency is improved by reducing the workload.