The invention discloses an online monitoring system for work equipment of an intelligent transformer station, and the system comprises a storage battery monitoring unit, a high-voltage power transmission node monitoring unit, a video monitoring unit and a central monitoring platform, wherein the storage battery monitoring unit, the high-voltage power transmission node monitoring unit, the video monitoring unit and the central monitoring platform are connected through a network. The storage battery monitoring unit comprises a battery voltage sensor, a battery current sensor, and a battery temperature sensor. The high-voltage power transmission node monitoring unit comprises a cable temperature sensor, a high-voltage switch cabinet temperature sensor, and a lightning arrester monitor. The central monitoring platform comprises a data analysis module, an alarm module, and a display module. According to the invention, the storage battery monitoring unit carries out the monitoring of the working state of a storage battery, and the high-voltage power transmission node monitoring unit carries out the monitoring of the working state of a high-voltage power transmission node. When the storage battery has a fault or a circuit is overloaded, the system gives an alarm, and a worker can timely carry out the processing according to the alarm information, thereby guaranteeing the safety operation of the intelligent transformer station, and effectively reducing the operation and maintenance cost of the intelligent transformer station.