Dimming switch execution module heat dissipation system

The utility model discloses a heat dissipation system of a light modulation switch execution module. The dimming device comprises a fan, a metal guide rail and a plurality of dimming modules arrangedon the metal guide rail in a sliding mode. The metal guide rail comprises a metal panel, a first sealing plate and a second sealing plate; the first closing plate and the second closing plate are usedfor being connected with a wall surface so as to form a ventilation channel with openings in the two ends among the wall surface, the metal panel, the first closing plate and the second closing plate; an air outlet of the fan is communicated with an opening in one end of the ventilation channel; the dimming module comprises a bottom shell, a PCBA board and a panel. Wherein a clamping groove is formed in the back face of the bottom shell, the metal panel penetrates through the clamping groove, an embedding hole is formed in the bottom shell, the PCBA board is fixedly embedded into the embedding hole, the back face of t