Abstract: A series of polybenzimidazole-lithium salt-poly(ethylene glycol) monomethyl ether blend all solid polymer electrolyte membranes were prepared through solution casting method. FT-IR, XRD, DSC and EIS measurements were used to characterize the structure and test properties of blend all solid polymer electrolyte. The influences of different component contents on mechanical strength and ionic conductivity were researched. The results showed that hydrogen bond between polybenzimidazole and poly(ethylene glycol) monomethyl ether existed; In the blend all solid polymer electrolyte, poly(ethylene glycol) monomethyl ether was amorphous; The glass transformation temperature(T_g) of poly(ethylene glycol) monomethyl ether decreased as the add of lithium salt; Blend all solid polymer electrolyte with higher poly(ethylene glycol) monomethyl ether content showed higher ionic conductivity and worse mechanical properties. Blend all solid polymer electrolyte with lithium trifluoromethanesulfonate showed higher ionic conductivity; the highest conductivity of these blend all solid polymer electrolytes was 3.58×10^-5 S/cm at room temperature and 3.3×10^-3 S/cm at high temperature, which can satisfy the lithium-ion battery used at high temperature.