To comprehensively use Antarctic krill resources, four acidic deep eutectic solvents were prepared for astaxanthin extraction. The optimization of the extraction considered the recycling of solvents and stability and antioxidant capacity of the extraction solution. Moreover, the extraction residue was used as a biosorbent. The enhancement of the acidity of deep eutectic solvents significantly increased the extraction efficiency of astaxanthin. The content of astaxanthin obtained by the deep eutectic solvent DL-menthol: acetic acid (MAA) under optimized conditions [extraction temperature: 25℃; extraction time: 1 h; solid-liquid ratio 1:10 (g/mL)] was 222.96 mg/kg, with good solvent recycling and antioxidant ability. The DL-menthol: caprylic acid (MOA) extract showed favorable color and concentration stability at 4 ℃. A strong positive correlation (average R2>0.9) was identified between the chromatism values observed in the deep eutectic solvent extracts and the corresponding astaxanthin concentrations during storage. The extraction residue was rough and porous, and the adsorption rate of the anionic dye Congo red reached 70%. This study provides valuable technical details for the selection and design of solvents for the extraction of natural astaxanthin and the efficient utilization of Antarctic krill.