Alternating power control valve for duplex hydraulic pump and duplex hydraulic pump

Embodiments of the invention disclose an alternating power control valve for a duplex hydraulic pump and the duplex hydraulic pump. A valve core of the alternating power control valve is of a two-stage step structure, and comprises a first step part and a second step part, wherein a ring groove is arranged in the outer circle of the first step part, the ring groove is used for communicating with an oil return port of the duplex hydraulic pump, the pilot oil pressure Ps acts on the end surface of the first step part, and the outlet average oil pressure Pm of the duplex hydraulic pump acts on the step surfaces of the first step part and the second step part; the alternating power control valve is used for discharging the pilot oil pressure Ps and the outlet average oil pressure Pm leaking tothe ring groove through the ring groove in order to block the interference of the pilot oil pressure Ps and the outlet average oil pressure Pm. According to the embodiments of the invention, the problems of large manufacturi