Locking method and system of intelligent door lock

The invention relates to the technical field of electronics and discloses a locking method and system of an intelligent door lock. A first human body inductor is installed in a door, a second human body inductor is installed out of the door, and human bodies are sensed through the first human body inductor and the second human body inductor. When both the first human body inductor and the second human body inductor detect the human bodies and time T1 when the first human body inductor detects the human bodies is earlier than time T2 when the second human body inductor detects the human bodies, the intelligent door lock judges that a user goes out, at this time, the intelligent door lock sends generated locking informing information to a pre-bound terminal device to inform the user to perform locking in time, and the situation that the users forget to lock the door is effectively avoided. Besides, after the intelligent door lock receives a locking instruction from the terminal device, that is, the intelligent door lock receives the locking instruction of the user, the door is locked automatically, the situation that the door is not well locked is avoided, and accordingly safety of the house of the user is improved.