Abstract: In order to treat the dust in the welding workshop, the dust distribution law of the welding workshop was studied. Using the method of theoretical calculation and the atmospheric turbulence diffusion model, and considering the situation that there were multiple dust sources in the welding workshop, the dust distribution of multiple dust sources was theoretically calculated and compared with the measured values. The feasibility of the theoretical calculation method was verified. The results showed that the dust was mainly distributed in the vicinity of the measuring point 13 and point 14 in the case of single area, the dust concentration at both points was 6.297 mg/m³. In the case of adjacent area, the dust was mainly distributed in the vicinity of the measuring point 16, the dust concentration here was 11.852 mg/m³. In the case of diagonal area, the dust concentration in the vicinity of the measuring point 24 was the largest, its concentration value was 9.088 mg/m³, the dust concentration in the vicinity of the measuring point 14 and point 15 was also large, its dust concentration was 6.284 mg/m³. And the dust concentration increased in multiple dust sources interaction areas.