A device and method for detecting a seal star function of an elevator system and readable storage medium on which a computer program for implementing the method is stored. The device for detecting a seal star function of an elevator system includes an elevator door bypass unit configured to enable power supply to an elevator motor and a holding brake when an elevator car is located in a set area and to cut off the power supply to the elevator motor and the holding brake when the elevator car leaves the set area; a control unit coupled with a safety relay and the elevator door bypass unit and configured to determine whether the seal star function is normal based on speed of movement of the elevator car within the set area.