The invention discloses a room-temperature addition silicone rubber ultra-light dental impression material for secondary impression, which is a two-component material, wherein the two components include a matrix component and a catalysis component; the matrix component consists of vinyl silicone oil containing two vinyl groups, hydrogen-containing silicone oil with three or more Si-H groups, a compatibilizer, a reinforcing agent, an inhibitor and the like; the catalysis component consists of polysiloxane containing two vinyl groupss, a compatibilizer, a reinforcing agent, a hydrophilic modifier, a platinum catalyst and the like. The material disclosed by the invention is simple to operate, and the process is simple and convenient; the material meets the requirements in terms of curing time, elastic recovery, tear strength, Shore hardness, tiny duplication and the like; the permanent hydrophilicity of the impression material is improved, the volume shrinkage of the impression material is reduced, the dimensional stability of the material is improved, the duplication accuracy of the material is high, and the tiny duplication of the impression is clear.