The ventilation device comprises a shell, a cold and hot module, an air inlet baffle, an air outlet baffle, a shifting rod, a
rotating disc and an elastic piece, an
air channel is formed in the shell, one end of the
air channel is provided with a hot air inlet and a
cold air inlet which are arranged up and down, and the other end of the
air channel is provided with a first air outlet and a second air outlet which are arranged left and right; the air inlet baffle can be turned up and down to open the hot air inlet or the
cold air inlet, the air outlet baffle can be turned left and right to open the first air outlet or the second air outlet, the shifting rod is provided with an abutting portion, and the
rotating disc is provided with a concave-
convex structure and can rotate to drive the air outlet baffle to be turned over through the second transmission structure. Meanwhile, the abutting part movably abuts against the concave-
convex structure to enable the deflector rod to swing up and down, and the deflector rod drives the air inlet baffle to turn over through the first transmission structure. The air inlet baffle and the air outlet baffle are simultaneously driven by the rotary table, switching of cold and hot air and switching of the left and right air outlets can be controlled only by driving the rotary table, the number of action mechanisms is small, the structure is compact, and control is easy.