Abstract: Crop harvesting efficiency has improved dramatically with the expansion of the crop planting scale and the popularization of mechanized harvesting methods. Grain mechanized drying is a significant development direction of postpartum crop processing. The traditional artificial drying efficiency is low and unsuitable for modern agricultural production. The mixed-flow dryer has attracted extensive attention as the most widely used dryer. This paper expounds on the working principle and structural composition of the mixed-flow dryer and compares the research status at home and abroad from three aspects: key component design, control system research, and auxiliary research means. This paper introduces the energy configuration of the mixed-flow dryer and the main problems of the dryer, such as poor equipment universality, low degree of automation, inaccurate simulation test results, large dust in the drying process, and non-integrated machine technology. The mixed-flow dryer is prospected by improving equipment universality, developing automatic monitoring and monitoring components, improving modeling accuracy, designing and developing relevant dust removal equipment, and mechanical technology integration.