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Aiming to address the lack of effective technologies and equipment for grain drying exhaust gas treatment, which affects the development of grain drying industry, a multi-effect dust removal technology and equipment integrating centrifugal sedimentation, agglomeration, and spray action for grain drying exhaust gas was developed. Initially, through simulation experiments, the effects of spray tower airflow velocity, spray angle, and spray pressure on the droplet field were analyzed. Single-factor experiments validated the simulation results and determined the appropriate range for airflow velocity, spray angle, and pressure. Subsequently, aiming for the highest dust removal efficiency, a three-factor three-level quadratic orthogonal regression experiment was carried out to construct a regression equation and response surface. The effects of airflow velocity, spray angle, and spray pressure on dust removal efficiency were analyzed for parameter optimization. It was proven that a uniform droplet field can be achieved at airflow velocities between 0.89 m/s and 1.33 m/s, spray angles between -15° and 0°, and spray pressures between 1 MPa and 1.5 MPa. The optimal parameter combination was identified as an airflow velocity of 0.92 m/s, a spray angle of -8.4°, and a spray pressure of 1.44 MPa. Experimental results showed that after optimization, the highest dust removal efficiency could reach 96.27%. Compared with a pulse dust collector, the average dust mass concentration of the grain drying exhaust gas treated by the multi-effect dust collector was 5.54 mg/m3, which was lower than 7.05 mg/m3 produced by the pulse dust collector and significantly below the national emission standard. This demonstrates that the treated grain drying exhaust gas can meet the emission standards using the developed multi-effect dust collector.