The present application relates to elevator safety technology, in particular to 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 according to one aspect of the present application comprises: 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 perform the following operations: placing a landing door and an elevator door associated with a safety switch in a closed state and placing the safety relay in an opened state; bringing the elevator door bypass unit into an enabled state to replace a safety circuit to perform a control function of the power supply to the elevator motor and the holding brake; determining whether the seal star function is normal based on speed of movement of the elevator car within the set area.