A safe and efficient descaling product was developed to solve the scaling problems of barium/strontium sulfate which are difficult to remove in oilfield systems. This product is composed of novel special chemical agent, co-solvent, new surfactant and dispersant, etc. Through the synergistic effect of all the components and various chemical reaction mechanisms, sulfate deposits in the system can be efficiently dissolved and removed. The product is suitable for solve the scaling problem of barium/strontium sulfate salts in various industrial l system.