The utility model discloses a combined grouting device for performing reinforcing and deviation-correcting on a building foundation. The combined grouting device comprises polyurethane grout pressing equipment, a polyurethane grout injection pipe group, cement grout pressing equipment and a cement grout injection pipe group, wherein the polyurethane grout injection pipe group is positioned in polyurethane grout injection drill holes in the building foundation and is connected with the polyurethane grout pressing equipment; the cement grout injection pipe group is positioned in cement grout injection drill holes in the building foundation and is connected with the cement grout pressing equipment; the interval between the cement grout injection pipe group and the polyurethane grout injection pipe group is 0.5 to 10 m. The combined grouting device has the advantages of simple structure and great convenience and high quickness in operation; the polyurethane grout injection pipe group and the cement grout injection pipe group are organically combined, so that the building foundation to be subjected to reinforcement and deviation-correcting can be subjected to combined grouting of polyurethane and cement; the building foundation can be uplifted precisely and rapidly, the reinforcing effect is remarkable, and the construction cost is greatly reduced.