The invention belongs to the field of air conditioners, and particularly provides an indoor unit of a suspended corner air conditioner. The problem that when large air output is needed by the indoor unit of the suspended corner air conditioner, the rotating speed of an air feeder is too high, and large noise is produced is solved. The indoor unit of the suspended corner air conditioner comprises ashell, an air inlet and an air outlet are formed in the shell, a heat exchange channel is formed between the air inlet and the air outlet, and a heat exchanger and the air feeder are arranged in theheat exchange channel. An air supplement inlet is further arranged on the shell, an air supplement channel is formed between the air supplement inlet and the heat exchange channel, and an air supplement fan and a purification module are arranged in the air supplement channel. The suspended corner air conditioner further comprises a fresh air pipe, the first end of the fresh air pipe is connected with the air supplement inlet, and the second end of the fresh air pipe communicates with the outdoor portion. By arranging the air supplement channel, the air supply rotating speed of the air feeder is reduced, so that the noise is reduced.