The invention discloses a self-resetting composite energy dissipation support utilizing gears to amplify displacement and pulleys to open inhaul cables. The self-resetting composite energy dissipationsupport is jointly composed of the gears, a sawtooth-shaped metal strip, the pulleys, the high-strength steel wire inhaul cables, viscoelastic dampers, buckling restrained braces and metal rubber energy dissipation devices; and under the action of a small earthquake, the small gears do not make contact with the sawtooth-shaped metal strip, the viscoelastic dampers play a role in energy consumption, under the action of a medium earthquake or a large earthquake, the small gears are meshed with the sawtooth-shaped metal strip to drive the gears and the pulleys to rotate, so that the high-strength steel wire inhaul cables are tensioned and applies tensile force to the high-strength steel wire inhaul cables, the high-strength steel wire inhaul cables play the same role as a prestressed tendon,therefore the purpose of self-resetting is achieved, the gears with different diameters are combined, displacement can be amplified, the high-strength steel wire inhaul cables bear larger tension, and the high-strength steel wire inhaul cables have high self-resetting capacity. The self-resetting composite energy dissipation support can achieve energy dissipation and seismic mitigation under earthquakes with different strengths and can achieve self-resetting under the conditions of medium and large earthquakes, and the safety of a main body structure is protected.