Combined three-phase short-circuit power cable discharge grounding probe

The invention discloses a combined type three-phase short-circuit power cable discharge grounding probe which comprises a puncture unit, a connecting assembly, a grabbing assembly arranged on the outer side of the connecting assembly, an extension assembly arranged at the bottom of the connecting assembly and a discharge assembly arranged at the bottom of the extension assembly. The protection assembly is arranged on the outer wall of the discharge assembly, and the adjusting puncture assembly is arranged at the bottom of the discharge assembly. The connecting assembly comprises a knocking plate, a three-way pipe is fixedly connected to the bottom of the knocking plate, a first threaded hole is formed in the bottom of the three-way pipe, a set of second threaded holes are formed in the outer wall of the three-way pipe, and the second threaded holes are symmetrically formed, so that a steel chisel can be inserted to pierce a three-core cable at the same time; since the three-core cable cores are arranged in a