The invention provides a target welding and cooling integrated device and an operation method thereof. The integrated device comprises a welding platform and a cooling platform, wherein the welding platform and the cooling platform are located on the same plane, a movable heating plate is arranged on the welding platform, and a transmission assembly is connected to the lower portion of the movableheating plate. The transmission assembly comprises a vertically-moving transmission assembly body and a horizontally-moving transmission assembly body. A pressurizing assembly is arranged above the cooling platform. According to the integrated device, the welding platform and the cooling platform are integrated in the same device, welding heating, automatic carrying and pressurizing cooling of atarget assembly can be integrally achieved, manual carrying is omitted, abnormal welding faces caused by vibration possibly occurring in the manual carrying process are avoided, the welding combination rate is high, and the potential safety hazard in the carrying process is reduced; and the device can automatically operate, welding and cooling of the target assembly can be rapidly achieved, time is saved, and cost is reduced.