The invention relates to a self-lock type pedal for climbing a telegraph pole and a use method of the pedal. The pedal comprises a foot fixing part, a pole climbing part, a driving part, an automatic control part, a power supply and a lock device; the foot fixing part comprises a foot bottom plate, a tail plate, side plates, a toothed strap and a locking strap; the pole climbing part comprises an arc-shaped supporting plate, a telescopic arm and an arc-shaped telescopic ring; the driving part comprises a speed reduction motor, a gear and a bearing; the automatic control part comprises a pressure triggering device and limiting switches, and the limiting switches comprise a first limiting switch, a second limiting switch and a stop dog; the power supply is electrically connected with the speed reduction motor through the pressure triggering device and the limiting switches, and the lock device comprises a through hole, a circular shaft, an eccentric block and a handle. The self-lock type pedal for climbing the telegraph pole is convenient, rapid, safe, comfortable and capable of adjusting closing or opening of the pole climbing part according to a signal pressure and being fixed on the telegraph pole through the lock device.