Reactive power compensation device and monitoring system

The utility model discloses a reactive power compensation device and a monitoring system, the reactive power compensation device comprises a communication unit, a first monitoring unit and at least one second monitoring unit, and each second monitoring unit is connected with a loop to be monitored. Each second monitoring unit monitors first electric energy data of the correspondingly connected to-be-monitored loop before reactive compensation, and sends the first electric energy data to the communication unit; the first monitoring unit is connected with each loop to be monitored, monitors second electric energy data of all loops to be monitored after reactive compensation, and sends the second electric energy data to the communication unit; the communication unit sends the second electric energy data and the first electric energy data to the upper computer; according to the reactive power compensation device provided by the utility model, the second electric energy data after reactive power compensation is mo