The invention discloses a method for automatically adjusting a clamping point and a stop block position of a bending machine. The method is mainly used for automatically calculating a mold height difference value of a mold selected by each program in a program library according to parameters of the mold in a mold library, and in the process of entering the program, the mold height difference valueof the mold can be judged and a teaching position and the stop block position of the current program can be automatically adjusted. By the adoption of the method, a user only needs to teach the clamping point once when a control device of the bending machine is just used, then molds can be freely switched or a machining program in the program library can be freely chosen, the clamping point position and the stop block position can be automatically adjusted, and the clamping point position and the stop block position in the program do not need to be repeatedly taught or manually adjusted evenif power-off restart occurs. According to the method, the working efficiency is improved, and meanwhile, the bending precision originally meeting requirements in the past can be kept unchanged, so that secondary error influence caused by manual readjustment is eliminated.