It is applicable for tubular bare terminals and pre-insulated terminal on non-welding connection complied with standard electrical connection. When crimping, the terminal should be put into crimping pliers laterally. The demanded pressing force must be reached before the brake unit automatically releases the jaw of the pliers. Thus high quality crimping standard could be ensured during repeatedly crimping. Due to perfect gripping position fixed and logical and light structure and the handle shape design meeting human being engineering principle, it reduces fatigue degree.