Composition solution and method for removing crystals on surface of low-alkali sulphoaluminate cement product

The invention discloses a composition solution and a method for removing crystals on the surface of a low-alkali sulphoaluminate cement product. The composition solution comprises a structure modification material and a hole sealing material. The structure modification material is prepared by mixing the following components in percentage by volume: 5.0%-12.0% of 0.01%-1.0% gallic acid aqueous solution, 5.0%-12.0% of 0.01%-1.0% lignosulfonic acid aqueous solution and 76.0%-90.0% of water. The hole sealing material is prepared by mixing the following components in percentage by volume: 4.0-10.0%of 0.06%-1.5% glycine aqueous solution, 4.0-10.0% of 0.06%-1.5% alanine aqueous solution and 80.0-92.0% of water. The structure modification material and the hole sealing material respectively fill into the structure modification pool and the hole sealing pool, and the cement product is sequentially soaked in the structure modification pool and the hole sealing pool for 12 and 24 hours so that the removal of crystals on