The invention provides a wall-mounted air conditioner indoor unit. The wall-mounted air conditioner indoor unit comprises a shell body, a 
heat exchanger, a jet 
assembly, a first air supplying assemblyand a second air supplying 
assembly, wherein the shell body comprises a cover shell and a 
front panel arranged on the front of the cover shell, and the shell body is arranged obliquely downwards relative to a 
supporting wall body to make an air supplying opening face the oblique lower portion; an air inlet is formed in the top wall of the cover shell; the jet 
assembly is arranged in the air supplying opening, the jet assembly comprises a first jet part and a second jet part which are arranged transversely, a first jet opening and a second jet opening are formed in the inner 
peripheral walls of the first jet part and the second jet part correspondingly, and the first jet opening and the second jet opening are correspondingly used for jetting 
airflow in the jet parts forward to drive 
ambient air in an air pumping hole defined by the inner 
peripheral walls of the jet parts to be sent to the oblique lower portion; and the first air supplying assembly and the second air supplying assemblyare correspondingly used for generating second heat exchanging 
airflow which enters from the air inlet, conducts heat exchanging with the 
heat exchanger and then is supplied to the interior of the corresponding jet part. According to the scheme of the wall-mounted air conditioner indoor unit, the air supplying volume is increased, and the whole indoor temperature is made to be decreased uniformly.