The utility model discloses a high voltage direct connection type electricity stealing detecting device. A signal collecting and sending module is formed by the orderly connection of a 10KV high voltage current and voltage collecting unit, a data merging unit and a wireless signal sending unit. A signal processing and controlling module comprises a control processing core. A primary data interface, a secondary data interface, a master station data interface and a man-machine interface are respectively connected to the control processing core. The wireless signal sending unit of the signal collecting and sending module is connected to the primary data interface of the signal processing module through a wireless channel. The master station data interface of the signal processing and controlling module is connected to a master station system through a wireless channel. The signal collecting and sending module is fixedly connected to one end of a telescopic insulating rod. According to the high voltage direct connection type electricity stealing detecting device, an electricity stealing behavior in a user secondary side metering device and loop can be rapidly, accurately and conveniently detected and judged and alarm is emitted timely, various electricity stealing behaviors are effectively prevented, and a basis is provided for the compensation of the quantity of electricity.