The utility model discloses a filter screen guiding structure of an indoor unit. The structure comprises a grating, and a filter net moving up and down along the inner side of the grating; projection parts are arrange on the inner side of the grating; and arranging direction of the projection parts is parallel to the moving direction of the filter net. According to the utility model, the filter net is protected from being clamped in the grating during a cleaning process, so damage to the filter net is reduced, and service lifetime of the structure is prolonged.