The invention provides an auxiliary comprehensive monitoring system for a transformer substation. The auxiliary comprehensive monitoring system comprises a transformer substation end system, a transmission network and a main station system, the transformer substation end system comprises an infrared thermal imaging on-line temperature measurement unit, a water supply and drainage intelligent control unit, an indoor cabinet equipment real-time monitoring unit, an intelligent light control unit, an intelligent exhaust unit, an intelligent air conditioning unit, an indoor main transformer liftable video monitoring unit, a portable monitoring unit, a station end man-machine interaction unit, a transformer substation channel illegal parking monitoring unit, an intelligent video inspection unit,a vehicle access management unit, a personnel safety monitoring unit, a regional positioning water leakage detection unit and a station end subsystem access integration unit. The transmission networkcomprises a station end transmission network, a station end-to-master station transmission network and a master station cross-regional network; the master station system comprises a master station service unit and a master station monitoring center unit, according to the invention, comprehensive management of states, security and protection, entrance guard and the like in the unattended transformer substation is achieved, the safe operation level of the transformer substation is improved, and the labor workload is reduced.