Drilling tool angle difference measuring instrument

The utility model discloses a drilling tool angle difference measuring instrument which comprises a main detector and an auxiliary detector. The auxiliary detector comprises a shell, a fixed frame, a fastening ring, a digital compass a and a wireless data emitting module, the main detector comprises a shell, a fixed frame, a fastening ring, a digital compass b, a wireless data receiving module, a miniature computer and a digital display screen, the compass a of the auxiliary detector is connected with the wireless emitting module by the assistance of an upper standard point and matched with the wireless data receiving module of the main detector, the wireless data receiving module is connected into a data input interface of the miniature computer, the digital compass b of the main detector is connected with another data input interface of the miniature computer through a data line, and an output of the miniature computer is connected with the digital display screen.