A flyback control mode-based controller includes a power supply circuit, a position-checking circuit, a current-checking circuit, a control circuit, and a power output circuit. The power output circuit includes a controlled energy conversion unit. The energy conversion unit includes a control switch and an energy conversion circuit. The energy conversion circuit uses the capacitor C circuit, the inductor L circuit, or the LC circuit to connect parallelly or serially with an inductor in a motor winding L so as to form an oscillation circuit, such that periodic oscillations with attenuation are enabled by relying on the energy stored in the motor winding L. By applying the controller to motors having forward control mode or motors having flyback control mode, the current to be released by the motor during discharging can be repeated used, thereby achieving maximum energy conservation.