Thread internal locking type drilling and milling tool

The utility model relates to a thread internal locking type drilling and milling tool which comprises a base plate, and connecting discs are arranged at the two ends of the base plate. The device further comprises a positioning cylinder, a motor, a screw head and a transmission shaft. The positioning cylinder is located on the upper end face of the base plate, a shell of the motor is connected with the lower end face of the base plate through the motor frame, the screw head is located in the positioning cylinder, external threads are arranged on the outer wall of the screw head, the transmission shaft is coaxially connected with the bottom end of the screw head, and the transmission shaft penetrates through a through hole in the base plate and is movably connected with the through hole through a bearing set. And a rotating shaft of the motor is coaxially connected with the transmission shaft. According to the utility model, the valve joint part which needs to be subjected to top surface drilling and end surfa