The invention discloses an SVG air-cooled heat dissipation system based on centralized air supply, which comprises an SVG cabinet body, a condensation apparatus, a compressor, an air inlet duct and anair-return duct, wherein the SVG cabinet body is provided with an air inlet and an air outlet, the air inlet is communicated with the air inlet duct, and the air outlet is communicated with the air-return duct; the air inlet duct is communicated with an outlet of the condensation apparatus through an air inlet pipe, the air-return duct is communicated with an air-return pipe through an inlet of the condensation apparatus so as to form a closed air-cooled heat dissipation cycle; the condensation apparatus and the compressor are communicated through a pipeline to form a heat absorption cycle; the cold air formed in the condensation apparatus is output to the air inlet duct, gets into the SVG cabinet body from the air inlet and flows together to the air-return duct via the air outlet after completing heat exchange, the hot air flows back into the condensation apparatus, exchanges heat with a heat exchange working medium in the heat absorption cycle to generate cold air and then continuous to circulate, and the high-temperature heat exchange working medium forms a low-temperature heat exchange working medium under the action of the compressor. The whole process is in a sealed loop, thereby ensuring a power module to be in a dust-free working state, and enabling the SVG cabinet to operate stably for a long time.