A method for configuring a reconfigurable physical unclonable function (PUF) based on a device with spin-orbit torque (SOT) effect is provided. The disclosure uses SOT or magnetic field to change the magnetic moment. After the current or magnetic field is removed, the magnetic moment returns to the easy axis direction. Under the effect of thermal fluctuation, the magnetic moment is randomly oriented in the easy axis direction. The non-volatile devices are formed into an array, the magnetic moments of all non-volatile devices are randomly distributed after a write operation. The read state can be used as a random code to implement the reconfigurable PUF. The PUF has a simple structure and guarantees security. The random code in the disclosure may be two-state or multi-state, which is related to the number of magnetic domains of the ferromagnetic layer. A large number of challenge response pairs form a strong PUF.