The invention discloses a plastic package type triode and a manufacturing process. The triode comprises a triode body, a first cooling fin, a first fixing plate, a first fixing rod, a second fixing rod, a first V-shaped groove, a first pin, a second pin, a second V-shaped groove, a third pin, a third V-shaped groove, a movable plate, a locking rod, a first through hole, a locking block, a second through hole, a first fixing block, a fixing shaft, a connecting groove, a mounting groove, a fixing ring, a spring, a limiting block and a guide rod. Through installation of the dustproof cover, the phenomenon that the triode body is burnt down due to the fact that dust absorbs moisture in air is avoided, through clamping connection of the locking block and the first through hole in the movable plate, the dustproof cover is rapidly put down and put away, and through installation of a first cooling fin and a second cooling fin, the cooling performance of the device is improved. By forming the first V-shaped groove, the second V-shaped groove and the third V-shaped groove, manual breaking of the first pin, the second pin and the third pin is achieved.