The invention discloses an electricity check ground insulation protection tube and a power distribution insulated wire electricity check grounding method. The protection sleeve comprises an inner positioning tube and an outer protection tube; a clamping slot is axially formed in the inner positioning tube, the width of the clamping slot is less than the radius of a power distribution insulated wire, and an elastic sheet is arranged on the inner positioning tube; the outer protection tube comprises a pair of outer tube bodies connected into a whole, and the pair of outer tube bodies are sleevedon the inner positioning tube and can move to and fro along the axial direction. When in use, a staff climbs to a grounding position and then applies force to expand the inner positioning tube to bedeformed and then the clamping slot is expanded to clamp a wire, then the force is removed and the inner positioning tube is recovered to the original state to tightly clamp the wire, a friction forceis provided by the elastic sheet to position the inner positioning tube, and the pair of outer tube bodies of the outer protection rube are sleeved on the inner positioning tube and connected into awhole, so that the outer protection tube can move to and fro along the axial direction to seal an exposed metal core, and thus the cable can be prevented from being exposed, the insulation performancecan be improved, and the personal security of the staff is ensured.