Gel electrolyte and lithium-sulfur secondary battery

The invention relates to a gel electrolyte and a lithium-sulfur secondary battery. The gel electrolyte comprises a liquid electrolyte, a polymerizable monomolecular organic matter and an initiator, wherein the liquid electrolyte comprises an ether organic solvent and a lithium salt; the polymerizable monomolecular organic matter is one or combination of more than one selected from the following structural formula: the formula is as shown in the specification, wherein R1, R2 and R3 are independently selected from an alkyl group or an alkyl acrylate group. According to the gel electrolyte disclosed by the invention, the probability of a monomolecular reaction can be effectively increased when a polymerization reaction occurs, so that the degree of polymerization of a polymer is improved; the gel electrolyte disclosed by the invention has high electrochemical performance and safety, so that, according to the lithium-sulfur secondary battery prepared by the gel electrolyte, the charging and discharging efficiency of the battery can be improved, and the battery has relatively high first-week discharging capacitance; and the preparation technology of the lithium-sulfur secondary battery is simple, and mass production is easily realized.