The invention relates to a light modified rubber foaming undersole material prescription and processing technology, which adopt butadiene rubber, butyl benzene colloidal particle, solution polymerized butadiene styrene rubber, nitrile rubber, silica, coupling agent, zinc oxide, rosin, active agent, stearic acid, antiager, crystallite wax, vomit-resistant acid agent for dosing and banburying mediating according to primary prescription, then the materials are pressed into a primary raw material piece by rolling of an open mill, the primary raw material piece is placed statically and then threw into the open mill, then dosing sulphur (bridging agents), accelerator agents, foaming agents and coloring agents in secondary dosing are added to the raw material piece, mixed and refined to obtain asizing material piece, and then static placing, blanking and vulcanization customization are conducted to obtain the light modified rubber foaming undersole material. The prescription and the processing technology have the advantages of being light in proportion, saving materials, being good in elasticity and flexibility, simple in raw materials and easy to recycle. Users who wear shoes made of the light modified rubber foaming undersole material feel convenient and comfortable.