The invention discloses a gelatinizer mother liquor for porous water-permeable concrete and a preparation method thereof. The gelatinizer mother liquor comprises, by weight, 57.0-58.0% of water, 19.0-20.0% of calcium chloride, 2.0-2.5% of ferrous chloride, 2.5-3.0% of ferrous sulfate, 3.0-3.5% of iron chloride, 1.5-2.0% of sodium chloride, 2.5-3.0% of sodium sulfate, 2.0-2.5% of magnesium sulfate, 1.5-2.5% of potassium sulfate, 2.4-3.0% of ammonia chloride, 0.1% of a stabilizing agent and 0.1% of a dispersant. The preparation method comprises respectively mixing the above materials and water to obtain a calcium chloride solution, an iron chloride solution, a magnesium sulfate solution, a potassium sulfate solution, a ferrous chloride solution, a ferrous sulfate solution, a sodium sulfate solution, a sodium chloride solution and an ammonia chloride solution and mixing all the solutions. The gelatinizer mother liquor improves concrete aggregate bonding performances, water permeability after construction and anti-compression and anti-bending strength, is convenient for maintenance, has a long novel road maintenance period, has mixing uniformity and improves production efficiency.