The invention provides an unlocking password processing method, door lock and foreground server, wherein the method comprises the following steps that the door lock obtains current time information; when the time length from generation of unlocking passwords last time is determined to reach a preset password generation cycle according to the obtained time information, the door lock encrypts password generation information of the current password generation cycle to obtain effective unlocking passwords in the current password generation cycle. By adopting the unlocking password processing method, the door lock and the foreground server provided by the embodiment of the invention, the possibility of divulging the unlocking passwords can be lowered.