The invention relates to a water selection method for domestic waste, which includes the following steps: (1) ragging, wherein, massive recoverable materials and other materials are separately sorted out; (2) crushing; (3) natural floatation, wherein, materials after crushing are put into water and left standing, and materials with a specific gravity lighter than that of water float up onto the water surface naturally; (4) air floatation, wherein, air is inflated from a bottom, bubbles attached to material pellets are formed, and secondary light materials which have a lighter specific gravity float up onto the water surface by carrying the bubbles; (5) swirl separation, wherein, the swirl is formed in the water, heavy materials with a larger specific gravity are left at the water bottom, middle materials which are lighter than the heavy materials flow together with the water under the impact of the swirl, and the middle materials and the heavy materials are separately screened and filtered from the water; and (6) flocculating settling, wherein, a flocculant is added in so as to carry out the flocculating settling to the water, sludge in the water is sunk at the water bottom, and upper clean water is recycled. The water selection method of the invention effectively classifies the domestic waste into a plurality of types according to the difference of quality and density, thus providing favorable conditions for recycling domestic waste.