A current sampling equivalent amplification method and circuit for identifying the initial position of a motor. The method comprising: constructing a controllable resistor network of which the resistance can be adjusted; when the motor is in the operation state of identifying the initial position of the rotor, increasing the resistance of the controllable resistor network, and a current sampling connection terminal (CDET) outputs an equivalently amplified current sampling signal; when the motor is in the starting state or in the normal operation state, decreasing the resistance of the controllable resistor network, and the current sampling connection terminal outputs a normal current sampling signal. The circuit comprises the controllable resistor network. One end of the controllable resistor network is simultaneously connected to a current output end (AGND) of the motor and the current sampling connection terminal, and the other end is grounded. The method and circuit provide high multiples of equivalent amp
