The invention provides an electrolyte material (LiaPbScMd) for an all solid-state lithium secondary battery and a preparation method for the electrolyte material. The electrolyte material, shown in a formula (I) LiaPbScMd, for the all solid-state lithium secondary battery is prepared from Li2S, P2S5 and a dopant, wherein the dopant is selected from one or more of compounds of nonmetal elements in main groups III, IV, V, VI and VII of lithium and compounds formed from at least two of the nonmetal elements in the main groups III, IV, V, VI and VII; in the formula (I), M is selected from one or more of the nonmetal elements in the main groups III, IV, V, VI and VII, a is more than 0 and less than or equal to 10, b is more than 0 and less than or equal to 5, c is more than 0 and less than or equal to 15, and d is more than 0 and less than 1. The electrolyte material for the all solid-state lithium secondary battery has high electrical conductivity, high electrochemical stability and the like, and is favorable for application. The invention also provides the all solid-state lithium secondary battery.