The invention discloses a preparation method for a sulfonated graphene oxide/stannic dioxide/polypyrrole composite material. Stannic dioxide granules are deposited in graphene oxide sheet interlayer by a hydrothermal method to prepare three-dimensional graphene oxide/stannic dioxide compound colloid; sulfonating on the prepared colloid is performed by aminobenzene sulfonic acid; and next, the sulfonated three-dimensional graphene oxide/stannic dioxide compound is coated with polypyrrole by adopting an interface polymerization method to prepare the sulfonated graphene oxide/stannic dioxide/polypyrrole three-dimensional porous net-shaped composite material. The preparation method is simple in process, green and environment-friendly, and reliable; and the prepared sulfonated graphene oxide/stannic dioxide/polypyrrole composite material adopts the three-dimensional porous net shape, has a regular and tidy space structure, high energy density and power density, and excellent cycling performance, is an ideal supercapacitor electrode material, and is particularly suitable for realizing industrial production.