Power supply system of solar energy refrigerator and power supply control method thereof

The invention discloses a power supply system of a solar energy refrigerator and a power supply control method thereof. The power supply system comprises a storage battery, a first switch unit, a photocell and a controller. The storage battery is used for supplying power for a solar energy refrigerator; a first terminal of the photocell is connected with a first electrode of the storage battery and a second terminal is connected with a second electrode of the storage battery through the first switch unit; and the photocell is used for utilizing solar energy to generate power; and the controller, which is respectively connected with the first switch unit and the storage battery, is used for controlling closing of the first switch unit when it is detected that the storage battery needs to be charged and is used for controlling disconnection of the first switch unit when it is detected that the storage battery does not need to be charged. According to the invention, losses of a photocell can be reduced as well as service life the photocell can be prolonged.