The invention relates to an electric appliance cabinet capable of automatically dissipating heat and preventing moisture. The electric appliance cabinet comprises an electric appliance cabinet door, an electric appliance cabinet shell, an electric appliance cabinet cavity, a blind window, a control module, a refrigerating device, a dehumidifying device, a temperature sensor and a humidity sensor, wherein one end of the electric appliance cabinet shell is connected with the electric appliance cabinet door; an upper port of the refrigerating device communicates with the electric appliance cabinet cavity through a first air inlet pipe from the upper end surface of the electric appliance cabinet shell and a lower port communicates with the electric appliance cabinet cavity; the upper port of the dehumidifying device communicates with the first air inlet pipe through a second air inlet pipe and the lower port communicates with a first air outlet pipe through a second air outlet pipe; a circulating pump is arranged in the first air inlet pipe; and a fan is arranged in the second air inlet pipe. The pipes are relatively few, so that the electric appliance cabinet is convenient to install and place, simple in structure and convenient to repair; and the high-temperature humid gas in the cabinet cavity can be quickly and timely extracted as much as possible, so that the targets of directly, effectively and quickly dissipating heat and preventing moisture are achieved.