Sealant for reinforcing steel plate

The invention discloses a sealant for strengthening steel plates, which does not produce bubbles and does not fall off after the use. The sealant comprises the following components by weight percentage: 5 to 30 percent of bisphenol A epoxy resin, 10 to 30 percent of dimer-modified epoxy resin, 10 to 20 percent of rubber-modified epoxy resin, 1 to 3.5 percent of solid coating calcium oxide and 1 to 3.5 percent of hygroscopic agent, namely liquid coating calcium oxide, 2 to 8 percent of curing agent, 1 to 3 percent of curing accelerator, 17 to 40 percent of filling agent, 5 to 15 percent of low-temperature shrinkage prevention agent, 0.3 to 1 percent of conductive imparting agent, 0.2 to 2 percent of stabilizer, and 1 to 5 percent of anti-sagging agent. The use of the product can reduce the problems of swelling and sealant falling off, improve the rigidity of outer plates of a vehicle body and the quality of inner and outer plates, particularly improve the wet resistance, and prevent the problems such as swelli