The invention discloses a thermal insulation material for an automobile battery and a preparation process of the thermal insulation material, relates to the technical field of new materials, and solves the problem that the overall tensile strength of a thermal insulation material for an automobile battery is easily reduced in a cold and hot alternating environment, and consequentially the performance of the battery is damaged. The thermal insulation material comprises a component A and a component B which are stored independently and mixed according to a weight part ratio of (7-8):1 when the thermal insulation material is used. The component A comprises the following components in parts by weight: 80-90 parts of polyether polyol, 6-10 parts of polyester polyol, 0.3-0.6 part of trihydroxypropane, 1.6-2.4 parts of polydimethylsiloxane, 0.3-0.5 part of catalyst, 8-15 parts of ethylene glycol, 2-5 parts of polyvinyl alcohol, 4-8 parts of wood flour, and 2.5-4.5 parts of lignin fiber; and the component B comprises the following components in parts by weight: 4-8 parts of toluene diisocynate, 0.8-1.2 parts of foaming agent, and 0.1-0.3 part of trifluoroethane. The thermal insulation material for the automobile battery has good temperature change resistance.