Overhead open wire half-cutting device

An overhead open wire half-cutting device belongs to the field of power line construction equipment. Comprising a semi-cutting hydraulic mechanism, a semi-cutting knife rest and a semi-cutting knife, the semi-cutting hydraulic mechanism comprises an upper semi-cutting hydraulic oil cylinder body, a lower semi-cutting hydraulic oil cylinder body and a cylinder column reset action spring, and the lower side portion of the lower semi-cutting hydraulic oil cylinder body is provided with a semi-cutting hydraulic oil cylinder oil inlet and return pipe connector; the end, facing the half-cut hydraulic oil cylinder lower cylinder body, of the half-cut hydraulic oil cylinder oil inlet and return pipe connector is communicated with the half-cut hydraulic oil cylinder oil inlet and return hole, the inner wall of the lower end of the half-cut hydraulic oil cylinder upper cylinder body is fixed to the outer wall of the upper end of the half-cut hydraulic oil cylinder lower cylinder body, and the half-cut hydraulic oil cyl