A smart window and a controller thereof, a power detection method and a non-transitory computer-readable storage medium are provided. The controller includes: a microcontroller; an output circuit coupled to the microcontroller and configured to output a driving signal under a control of the microcontroller; a first power supply coupled to a load through the output circuit and configured to supply an operating power supply to the load; a sampling resistor between the output circuit and the first power supply, a first terminal of the sampling resistor being coupled to the first power supply, and the second terminal of the sampling resistor being coupled to the output circuit; and a power acquiring circuit coupled to the microcontroller and coupled to the first terminal and the second terminal of the sampling resistor, respectively.