The utility model relates to a distribution transformer pressure regulating system belongs to power equipment technical field. In this system, each regulating winding in A phase winding, B phase winding and the C phase winding establishes ties respectively and connects the main winding behind the voltage regulating switch, a voltage regulating switch is parallelly connected to be had the current -limiting branch road and protects the branch road with respectively having in A phase winding, B phase winding and the C phase winding, voltage regulating switch comprises the thyristor of two reverseparallel connections, the thyristor series connection transition resistance of current -limiting two reverse parallel connections of route forms, a protection withstand voltage resistors of route accontactor series connection, all install voltage transformer on a phase winding, b phase winding and the c phase winding. The utility model provides a distribution transformer pressure regulating system becomes on -load tap -changer as the distribution with the thyristor of reverse parallel connection, at the in -process that switches the tap, compares with traditional mechanical type tapping switch, and thyristor switching speed is faster, and transient process is reliable more, stable, is favorable to improving voltage quality.