The invention discloses a switch cabinet discharge online monitor and relates to the technical field of power switch cabinet operation and maintenance equipment. The switch cabinet discharge online monitor comprises a base, a first motor arranged on the base, a turntable connected with a rotating rod of the first motor, a second motor disposed on the turntable, an ozone detecting component connected to a rotating rod of the second motor, a controller, a wireless communication module, an alarm device and an intelligent terminal. Through the base, the first motor, the turntable, the second motor, the ozone detecting component, the controller, the wireless communication module, the alarm device, the intelligent terminal and the like, the detection sensitivity is high, the detection speed is high, real-time information sharing is achieved, operation and maintenance personnel can find out which switch cabinet has partial discharge in time, and convenience is provided for unified management.