The invention discloses a power stringing line-cross device which comprises a pedestal fixed on the upper end of an insulating rod and an upper cover hinged and buckled to the pedestal. A base wheel is installed in a pedestal groove of the pedestal, and an auxiliary wheel is installed in an upper cover groove of the upper cover through an adjusting device. A support bar is fixed to the outer wall of the pedestal, a transfer rod is hinged to the tail end of the support bar, and an upper connecting rod is hinged to the upper end of the transfer rod. The upper end of the upper connecting rod and the outer wall of the upper cover are correspondingly hinged together, and an upper sliding sleeve slidingly sleeves the lower section of the transfer rod. An insulating bar downwardly extending along the insulating rod is hinged to the central section of the upper sliding sleeve, and an intermediate sliding sleeve in sliding fit with the insulating bar in the axial direction is fixed on the insulating rod. The upper portion of the insulating rod is provided with a swinging chamber matching with the lower section of the transfer rod. The power stringing line-cross device can be rapidly assembled and erected, enables line crossing, jumping and leading on the ground, and is easy to operate and high in safety. No climbing is required.