The invention discloses a tail gas treatment device for producing MBS. The tail gas treatment device comprises a reaction chamber (1), the left side of the reaction chamber (1) is connected with a tail gas conveying pipe (2), and an electrostatic dust collector (11) is arranged in the reaction chamber (1). A dust outlet (3) is formed in the lower portion of the reaction chamber (1), and corresponds to the electrostatic dust collector (11), and an air outlet (4) is formed in the upper portion of the reaction chamber (1) and provided with a regulating valve (5). The right side of the reaction chamber (1) is connected with a waste heat supply pipeline (6) which is connected with a heating fan (7). A dust content monitoring device (10) is arranged at the exhausting position of the electrostatic dust collector (11). According to the tail gas treatment device, tail gas can be effectively utilized, production cost can be reduced, and the pollution degree to environment is lowered.