The invention discloses a liquid organic fertilizer prepared from kitchen waste, and a production process thereof, and belongs to the technical field of fertilizers. The liquid organic fertilizer comprises, by weight, 60-70 parts of kitchen waste, 15-20 parts of straw, 2-3 parts of zymophyte, 1-1.5 parts of nitrogen-fixing bacteria, 0.5-1 part of bacillus mucilaginosus, 0.2-0.5 part of purple bacteria, 3-5 parts of supplementary nutrients, 10-15 parts of potassium hydroxide solution, 4-8 parts of decomposed coal, 5-10 parts of urea, and 200-300 parts of deionized water. Nutrient substances aresupplemented, zymophyte continuously consumes the nutrient substances in the high-temperature fermentation process, after high-temperature fermentation is finished, the nutrient substances in fermentation liquor are sharply reduced, ammonium sulfate, magnesium sulfate, potassium phosphate and calcium carbonate are additionally added into the fermentation liquor to supplement elements needed by the zymophyte, the nutrient substances are kept sufficient, and the nutrient content of the zymophyte is increased. By adding the decomposed coal and a potassium hydroxide solution, the activation of the decomposed coal is facilitated, so that humic acid is converted into a soluble state, and the absorption of crops is facilitated.