An indoor unit of an air conditioner, comprising a cleaning member, and a face frame defining an air inlet, the cleaning member comprising a filter screen rail module, characterized in that: the filter screen rail module is disposed adjacent to the air inlet, and is separable from the face frame, and the filter screen rail module comprises a rail in which the filter screen can move, wherein the cleaning member further comprising: a filter screen disposed on the rail; and a cleaning module mounted on the filter screen rail module, wherein the filter screen is connected to the cleaning module, and the cleaning module is configured to drive the filter screen to move in the rail for cleaning the filter screen; wherein the rail comprises a first rail and a second rail communicating with the first rail, and wherein the filter screen rail module comprises: a first grille; a second grille spaced apart from the first grille; and an intermediate grille disposed between the first grille and the second grille, wherein the first rail is defined between the first grille and the intermediate grille, the second rail is defined between the second grille and the intermediate grille, and the filter screen is movable in the first rail and the second rail; wherein the filter screen rail module further comprises: a mounting space for accommodating the cleaning module, wherein the first rail is in communication with the second rail through the mounting space, and wherein the cleaning module is configured to drive the filter screen to move in the first rail and the second rail to clean the filter screen; characterized in that the mounting space is defined by the first grille, the second grille and the intermediate grille cooperatively, wherein an end of the first grille is outwardly protruded with respect to an end of the intermediate grille and an end of the second grille, and wherein the mounting space is defined by the end of the first grille, the end of the intermediate grille, and the end of the second grille cooperatively. the filter screen rail module is disposed adjacent to the air inlet, and is separable from the face frame, and the filter screen rail module comprises a rail in which the filter screen can move, wherein the cleaning member further comprising: a filter screen disposed on the rail; and a cleaning module mounted on the filter screen rail module, wherein the filter screen is connected to the cleaning module, and the cleaning module is configured to drive the filter screen to move in the rail for cleaning the filter screen; wherein the rail comprises a first rail and a second rail communicating with the first rail, and wherein the filter screen rail module comprises: a first grille; a second grille spaced apart from the first grille; and an intermediate grille disposed between the first grille and the second grille, wherein the first rail is defined between the first grille and the intermediate grille, the second rail is defined between the second grille and the intermediate grille, and the filter screen is movable in the first rail and the second rail; wherein the filter screen rail module further comprises: a mounting space for accommodating the cleaning module, wherein the first rail is in communication with the second rail through the mounting space, and a filter screen disposed on the rail; and a cleaning module mounted on the filter screen rail module, wherein the filter screen is connected to the cleaning module, and the cleaning module is configured to drive the filter screen to move in the rail for cleaning the filter screen; wherein the rail comprises a first rail and a second rail communicating with the first rail, and wherein the filter screen rail module comprises: a first grille; a second grille spaced apart from the first grille; and an intermediate grille disposed between the first grille and the second grille, a first grille; a second grille spaced apart from the first grille; and an intermediate grille disposed between the first grille and the second grille, wherein the first rail is defined between the first grille and the intermediate grille, the second rail is defined between the second grille and the intermediate grille, and the filter screen is movable in the first rail and the second rail; wherein the filter screen rail module further comprises: a mounting space for accommodating the cleaning module, wherein the first rail is in communication with the second rail through the mounting space, and a mounting space for accommodating the cleaning module, wherein the first rail is in communication with the second rail through the mounting space, and wherein the cleaning module is configured to drive the filter screen to move in the first rail and the second rail to clean the filter screen; characterized in that the mounting space is defined by the first grille, the second grille and the intermediate grille cooperatively, wherein an end of the first grille is outwardly protruded with respect to an end of the intermediate grille and an end of the second grille, and wherein the mounting space is defined by the end of the first grille, the end of the intermediate grille, and the end of the second grille cooperatively.