An air conditioner indoor unit, comprising: a base module, having a base part which is arranged with a fan motor; a heat exchange module having a heat exchanger and a connection pipeline for connecting the heat exchanger to an air conditioner outdoor unit; the heat exchanger and the connection pipeline are arranged in such a way that in a mounted state, the heat exchanger and the connection pipeline are entirely located at a front side of the base module; and an air and water duct module having an air duct assembly; wherein the air duct assembly is adapted to be entirely disassembled from the base part without disassembling the fan motor in the base part, and wherein the air and water duct module has a bottom shell and an impeller which is rotationally mounted on the bottom shell; characterized in that an impeller shaft of the impeller is configured to be, by means of a quick release connecting structure, connected with and separated from an output shaft of the fan motor through a position movement between them, the quick release connecting structure comprising a clamping groove formed in the impeller shaft of the impeller and a clamping claw arranged on the output shaft of the fan motor and mating with the clamping groove, wherein at the working position of the fan motor, the clamping claw extends into the clamping groove and the output shaft is configured to rotate so to drive the impeller shaft to rotate, and wherein at the quick release position of the fan motor, when the fan motor is disassembled after the fan motor is unlocked, the clamping claw is configured to be extracted from the clamping groove. a base module, having a base part which is arranged with a fan motor; a heat exchange module having a heat exchanger and a connection pipeline for connecting the heat exchanger to an air conditioner outdoor unit; the heat exchanger and the connection pipeline are arranged in such a way that in a mounted state, the heat exchanger and the connection pipeline are entirely located at a front side of the base module; and an air and water duct module having an air duct assembly; wherein the air duct assembly is adapted to be entirely disassembled from the base part without disassembling the fan motor in the base part, and wherein the air and water duct module has a bottom shell and an impeller which is rotationally mounted on the bottom shell; characterized in that an impeller shaft of the impeller is configured to be, by means of a quick release connecting structure, connected with and separated from an output shaft of the fan motor through a position movement between them, the quick release connecting structure comprising a clamping groove formed in the impeller shaft of the impeller and a clamping claw arranged on the output shaft of the fan motor and mating with the clamping groove, wherein at the working position of the fan motor, the clamping claw extends into the clamping groove and the output shaft is configured to rotate so to drive the impeller shaft to rotate, and wherein at the quick release position of the fan motor, when the fan motor is disassembled after the fan motor is unlocked, the clamping claw is configured to be extracted from the clamping groove.