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The extractor is one of the core components of the sugarcane chopper harvester, and its performance plays a vital role in the impurity rate of the sugarcane harvester, while the impeller is the core component of the extractor, and its aerodynamic characteristics is closely related to the effect of the exhaust. Aiming at the problem of insufficient optimization of the performance of the impeller of the miscellaneous fan of the sugarcane harvester, which affects the miscellaneous effect, taking the impeller of the miscellaneous fan of the transverse sugarcane harvester as the object, and the influences of the type of hub, mounting angle of the impeller β, number of the impeller Nb, dimensionless area of the impeller G, angle of the impeller γ on the aerodynamic characteristics of the fan and its mechanism were researched. With the objective of increasing the full pressure of the fan, the best impeller structure parameters were obtained by the response surface optimization method, which were the blade mounting angle of 23.34°, the impeller dimensionless area of 0.43 and the blade angle of 14.56°. Field experiments were conducted at different fan speeds (1050r/min, 1350r/min and 1650r/min), different cane growth conditions (good, poor and severe collapse) and different traveling speeds (1km/h, 2km/h and 3km/h). The results showed that for sugarcane with good growth, the optimized turbines reduced the impurity rate by 1.06, 1.99 and 3.28 percentage points at different driving speeds when the turbine rotational speed was 1050r/min;when the turbine rotational speed was 1350r/min, the optimized turbines reduced the impurity rate by 2.5 percentage points at most;when the turbine rotational speed was increased to 1650r/min, the optimized fan did not show obvious differences in the impurity rate at each driving speed;for the sugarcane with poor growth and serious collapse, the optimized fan could reduce the impurity rate by up to 5.45 and 2.1 percentage points, respectively. The optimized fan improved the ability of the sugarcane harvester to remove impurities in complex field environments, and the obtained data can provide theoretical support for subsequent fan research.