Hardening liquid used for strengthening top of low temperature SCR denitration catalyst module and application thereof

The invention discloses a hardening liquid used for strengthening the top of a low temperature SCR denitration catalyst module and application thereof. The hardening liquid is prepared from the following raw materials by weight: 100 parts of water, 0.1 to 8 parts of a hardener, 0.1 to 10 parts of a waterproof agent and 0.1 to 4 parts of a stabilizing agent. After calcinations and saw cutting of a low temperature SCR denitration catalyst, the top of the catalyst is dipped in the hardening liquid and then taken out, unneeded liquid on the top is removed by using compressed air, and finally, the top is subjected to natural air drying. The hardening liquid provided by the invention enables a permanent water-proof film to be formed on the top of the catalyst, so the catalyst is prevented from easy deliquescence and falling off, can effectively resist abrasion and corrosion and has a prolonged service life.