Horizontal on-load capacity-regulating tap switch

The utility model discloses a horizontal on-load capacity-regulating tap switch, which comprises a shell, and a vacuum arc extinguishing assembly, a double-station switching assembly, a low-voltage contact assembly and a wiring assembly which are fixed in the shell, the shell comprises an insulating substrate, the wiring assembly is provided with a plurality of first wiring pieces, and the insulating substrate is provided with a plurality of second wiring pieces. The wiring assembly is provided with a plurality of first wiring pieces, the first wiring pieces are in lap joint with taps on the high-voltage side of the transformer, the wiring assembly is further provided with a plurality of second wiring pieces, the second wiring pieces are in lap joint with taps on the low-voltage side of the transformer, and the double-station switching assembly comprises a movable contact set and a static contact set. The vacuum arc extinguishing assembly can disconnect the electric connection with the movable contact group a