Time synchronization method, system and equipment of non-networked door lock and medium

The invention discloses a time synchronization method, system and device for a non-networked door lock and a medium. Comprising the steps that a mobile terminal and a time server conduct time synchronization, the mobile terminal sends time synchronization notification information to a project management terminal, and the time synchronization notification information is indication information for time synchronization of a non-networked door lock; the mobile terminal writes the current local time of the mobile terminal into the IC card, when the IC card is close to the non-networked door lock, the non-networked door lock reads the local time stored in the IC card, calculates a local time deviation value according to the local time stored in the IC card, and compensates the local time of the mobile terminal according to the local time deviation value and a preset time compensation value. And calibrating the local time of the non-networked door lock. According to the invention, the time of the non-networked door