The invention relates to the field of storage batteries, and aims at providing a lead-acid storage battery separator electrolyte separating device. The lead-acid storage battery separator electrolyte separating device comprises a base, a vertical base which is provided with a support oblique plane and has the big end connected with the upper end of the base, two rotating arm groups symmetrically arranged at two opposite side ends of the vertical base, an extrusion plate with one end surface thereof opposite to and parallel with the support oblique plane, and a push-pull block connected with the other end surface of the extrusion plate. Each rotating arm group is composed of at least two rotating arms which are arranged in parallel; one end of each rotating arm is hinged to the side end of the vertical base; the other end of each rotating arm is hinged to the extrusion plate respectively; an electrolyte storage groove with the upper end thereof opposite to the lower end of the support oblique plane is formed in the upper end of the base; and a stop valve communicated with the electrolyte storage groove is arranged at the side end of the base. The lead-acid storage battery separator electrolyte separating device is low in labor intensity and relatively high in electrolyte extrusion rate, requires a small number of AGM separators, and is not easy to damage.