The invention relates to a method used for locking the position of an automatic translation door. The existing method needs manual control and has low reliability. The method of the invention has the following steps: firstly, initializing a controller; continuously detecting the rising edge and the falling edge of Hall signal fed back in the motor position; then, carrying out automatic learning in the door opening position and the door closing position; next, judging whether the current position enters the locking state or not; entering a position locking mode if a position locking mark is true; and finally, starting the motor so that the displacement amount of the translation door is smaller than or equal to the displacement threshold value. The method of the invention has the advantagesthat the cost is low, all functions are realized through software on the basis of not changing the existing circuit or the existing mechanical mechanism, and the locking torque of the motor position is in self-adaptive change along with the intensity of external acting force.