The invention provides a shotcrete additive and a spraying technology of shotcrete. The shotcrete additive comprises: 15-25 parts of a setting accelerator, 50-80 parts of a reinforcing agent, 1-5 parts of a dispersant, and 0.1-6 parts of a flocculating agent. The invention also provides a spraying technology of shotcrete. The technology employs the above shotcrete additive and utilizes an existing dry shotcreting machine under a coal mine for wet shotcreting operation. Therefore, the problems that existing dry shotcreting additives cannot satisfy the technological requirements of wet shotcreting as well as dry shotcreting technologies have a high dust concentration can be solved.