The invention provides a crimping-type power electronic device valve group with a crimping tool and a crimping method thereof, which belong to the field of power electronic device assembling. The crimping-type power electronic device valve group with a crimping tool comprises a crimping-type power electronic device valve group and a crimping tool, wherein the crimping-type power electronic device valve group also comprises a pressing rod and a pressing disc sequentially arranged right below an upper end plate, and a pressure gauge placed on the upper surface of the upper end plate; the crimping tool comprises an upper platform, a lower platform, four vertically-arranged supporting rods located at corner parts of the upper platform and the lower platform, and a hydraulic cylinder located in the middle of the upper platform; the middle of the upper platform is also provided with a through hole for enabling the piston of the hydraulic cylinder to pass through; and the well-joined crimping-type power electronic device valve group is placed right below the hydraulic cylinder and is supported by the lower platform. The size and the force bearing point of a crimping force can be accurately controlled through the hydraulic mechanism, manpower is saved, and the reliability of the power electronic device is improved.