Thermosetting resin composition, epoxy resin material, composite material of epoxy resin material and preparation method of composite material

The invention provides a thermosetting resin composition. The thermosetting resin composition comprises an epoxy curing agent, an epoxy resin component, a free radical initiator, a reactive diluent, a flexibilizer and a polyurethane compound, the epoxy resin component comprises an epoxy group so as to carry out a ring-opening addition reaction under the action of the epoxy curing agent, and each molecule of the reactive diluent comprises at least one acrylate group so as to carry out a free radical polymerization reaction under the action of the free radical initiator; in every 100 parts of the epoxy resin component, the part number of the free radical initiator is 0.01 to 7, the part number of the reactive diluent is 3 to 60, the part number of the epoxy curing agent is 1 to 120, the part number of the flexibilizer is 1 to 15, and the part number of the polyurethane compound is 3 to 15. The problem that the tensile strength and the bending strength of the cured epoxy resin are reduced after the flexibilizer