The invention belongs to the technical field of environmental protection and in particular relates to an electrodynamic force ultraviolet photolysis in-situ repair device and a repair method thereof. The device consists of a power supply, an anode, a cathode, a dosing well, a collecting well, a transmission pump, a ground treatment system, a lifting control safety spring and an ultraviolet photolysis system. According to the device, the electrodynamic force system is combined with the hydrogeololgy conditions in a contaminated area, a catalytic analysis agent is added into a dosing well, and underground water and pollutants which are required to be treated as well as the added catalytic analysis agent is collected in a collecting well; the contaminated underground water is subjected to photolysis treatment through the ultraviolet photolysis system; and the underground water subjected to photolysis is conveyed to a ground treatment device for detection and treatment through the transmission pump, and treated water is detected to reach the standard and recharged underground. The underground water contaminated by polychlorinated biphenyl can be effectively remediated through the ultraviolet photolysis system, the motion rate of the pollutants can be increased through the electrodynamic force system and the catalytic analysis agent, and the remediation efficiency and effect of the underground water are greatly improved.