The invention discloses an installation structure of an inner wind path fan of a cooler. The installation structure comprises a ventilation cabinet, fan components, a left volute cover plate and a right volute cover plate, wherein a fan installing hole is formed in a top plate of the ventilation cabinet, a left volute installing hole is formed in the left side wall of the ventilation cabinet, and a right volute installing hole is formed in the right side wall of the ventilation cabinet; the fan components comprise a fan, a fan rear plate and fan blades, a connecting plate and the fan rear plate are respectively provided with a concave part, a motor is arranged on the concave part of the connecting plate, the fan installing hole is covered with the connecting plate, and the connecting plate is detachably connected with the top plate of the ventilation cabinet; the left volute cover plate is arranged on the left volute installing hole, a left half volute is arranged on the inner side of the left volute cover plate, the right volute installing hole is covered with the right volute cover plate, a right half volute is arranged on the inner side of the right volute cover plate, and the left half volute and the right half volute are arranged oppositely and form a whole volute. According to the installation structure of the inner wind path fan of the cooler disclosed by the invention, the maintenance space can be saved.