The invention belongs to the field of overhead working safety equipment, and relates to a trunk protector, in particular to an overhead working falling trunk protector. The overhead working falling trunk protector is characterized in that a box body is formed by buckling an upper cover and a lower cover, and is internally provided with a folding gas bag and a gas generator; the gas generator is internally provided with an electric detonator capable of triggering start-up of the gas generator; the electric detonator is connected with an electronic lighter; the electronic lighter is connected with an electrical return circuit; the electrical return circuit is internally provided with an insulation tube; the insulation tube is internally provided with a copper column capable of sliding along the interior of a tube body; and one end of the insulation tube is connected with a lead wire in the electrical return circuit, thereby allowing that when the copper column slides to the end, connected with the lead wire, of the insulation tube, the electrical return circuit is put through, and that when the copper column is far away from the end, connected with the lead wire, of the insulation tube, the electrical return circuit is disconnected. The overhead working falling trunk protector can effectively reduce a human body damaged degree in a falling accident, and reduces a death rate and a high paraplegia rate of the falling accidents from a high place.