Authority control method and system for intelligent door lock

The invention discloses an authority control method and system for an intelligent door lock. The authority control method includes the steps that communication between a host and a smart phone APP of a house owner is established; communication between the host and multiple sub-machines is established; a preset unlocking instruction input by the house owner through the smart phone APP is received by the host; an unlocking password input externally is received by the host; the host judges whether the unlocking password input externally is consistent with a preset unlocking password or not according to the received preset unlocking instruction; if yes, whether the current unlocking time is consistent with the preset unlocking time or not is further judged; and if the current unlocking time is consistent with the preset unlocking time, the host unlocks the door lock of a house door, meanwhile, the host generates a control instruction for controlling a sub-machine corresponding to a room door to be unlocked to synchronously unlock a lock of the room door and sends the control instruction to the corresponding sub-machine, and therefore the lock of the room door is synchronously unlocked conveniently by the corresponding sub-machine according to the control instruction.