The utility model discloses a pre-make modularization <{EN0}> secondary equipment system for a transformer substation; the secondary equipment system comprises a monitoring system module, an integrated power supply module and an intelligent auxiliary control module in data communication with the monitoring system module through Ethernet, and a scheduling communication module and a local spacing layer module connected with the monitoring system module. The secondary equipment can be reasonably classified so as to be pre-make modules, thus reducing work load of debugging field installation junction box, reducing construction difficulty, improving construction efficiency, and compressing construction period of the transformer substation.