The invention discloses an oxygen adjusting system for an air conditioner, and relates to the technical field of oxygen generation molecular sieves. According to the technical scheme, the oxygen adjusting system is characterized by comprising a mounting box embedded in one side of an air conditioner indoor unit, an air outlet fan embedded in one side, far away from the air conditioner indoor unit,of the mounting box, and an oxygen inlet valve mounted on one side, far away from the air outlet fan, of the mounting box; an oxygen outlet pipe is fixed to the side, close to the oxygen inlet valve,of the air outlet fan; the oxygen inlet valve comprises an annular fixing box and four connecting shafts evenly distributed on the inner circumferential face of the annular fixing box in the circumferential direction of the annular fixing box; the end, away from the annular fixing box, of each connecting shaft is rotationally connected with the peripheral face of fixing columns; a and fan-shapedvalve is fixed on the peripheral surface of each connecting shaft; a bevel gear ring is rotationally installed on the side, away from the air outlet fan, in the annular fixing box, a first bevel gearis fixed to the end of each connecting shaft, and each first bevel gear is engaged with the bevel gear ring. According to the oxygen adjusting system, the problem that the indoor oxygen content is toohigh is solved, and the effect of controlling oxygen to be transmitted into a room is achieved.