The invention discloses a quick repairing material and a preparation method. The quick repairing material is prepared from sulphoaluminate cement, fly ash, intermediate sand, polyvinyl alcohol fiber,water and a chemical admixture, and comprises the following specific components: 100 parts of sulphoaluminate cement, 0-30 parts of fly ash, 80-100 parts of intermediate sand, 0.8-1.2 parts of a naphthalene water reducing agent, 0-0.5 part of borax, 0-0.12 part of sodium gluconate, 0-0.15 part of citric acid, 0-1.5 parts of lithium carbonate, 0-2.0 parts of aluminum sulfate, 0-1.5 parts of aluminum chloride, 0-1.5 parts of calcium nitrate, 0-2.0 parts of sodium chloride and 0-2.0 parts of polyvinyl alcohol fiber. Firstly, the repairing material can be constructed under the temperature condition of 10 DEG C below zero to 40 DEG C, the initial setting time is 15-25 minutes, and the final setting time is 25-35 minutes; secondly, the repairing material achieves excellent compressive strength,the 2h compressive strength is 15-45MPa, and the 7d compressive strength is 45-80MPa; finally, the polyvinyl alcohol fiber is selected for reinforcing the sulphoaluminate cement, so that the quick repairing material has the 1d folding strength of 10-12MPa, the 7d folding strength of 12-14MPa and the 7d bending strength of 5-7MPa, and is free of dry shrinkage, therefore, requirements on quick hardening, high strength and toughness of a repairing project can be met.