The invention relates to a low-foam bathing product and a preparation method thereof, in particular to a washing-free low-foam bathing product for a space or diving environment and a preparation method thereof and aims at solving the problems that an existing bathing product for workers at a space station and a submarine makes the skin red and swollen easily and hurts the skin. The washing-free low-foam bathing product is prepared from sodium lauroyl glutamate, n-decyl glucoside, lecithin, xanthan gum, glycerinum, aloe vera gel, sophocarpidine, climbazole, vitamin, wheatgerm oil, sodium chloride and citric acid. The preparation method comprises the steps that firstly, the raw materials are weighed; secondly, sodium lauroyl glutamate, n-decyl glucoside, lecithin and xanthan gum are mixed to be uniform under heating in a water bath, the mixture is transferred into a homogenizer to be homogenized, the homogenized material is transferred into the water bath, glycerinum, aloe vera gel, sophocarpidine, climbazole, vitamin E and wheatgerm oil are added, the mixture is stirred to be uniform, then, sodium chloride is added to adjust the viscosity of a system, and citric acid is added to adjust the pH value; thirdly, sealed packaging is carried out through aluminum foil.