The invention discloses a polyester-covering cotton knitted fabric dyeing method. The dyeing method comprises the steps of pretreatment, polyester dyeing, cotton dyeing, soaping, fixation, softening, and dewatering and drying, wherein in the polyester dyeing process, a 1.0 g/L polyester leveling agent, 1.2 g/L acetic acid and 0.6 g/L sodium acetate are used; in the cotton dyeing process, 80 g/L sodium sulfate, 20 g/L sodium carbonate and a 1.0 g/L cotton leveling agent are used. The obtained polyester-covering cotton knitted fabric is firm and uniform in dyeing and good in hand feeling.