Aiming at the problem of grain moisture detection equipment not matching and the inability to quickly and accurately determine the moisture content of various coarse cereals. According to international standard for oven method, combined with the theory of grain weightlessness, the transferring multistage type quick measuring moisture content equipment was designed by using TRIZ innovative design method, which realized orderly and reliable operation of loading disc on cylindrical cam track. The simulation design and assembly verification of key components such as multi-station transfer mechanism, automatic weighing system and flash drying mechanism were completed. The PLC coupling control technology was applied to realize the cyclic switching of three working positions: quantitative feeding, flash drying measurement and rapid material removal. Accurate moisture value of grain can be obtained in real time by precise modular operation. The quadratic orthogonal rotational combination design method was used to construct a quantitative model for synergistic evaluation of moisture detection accuracy and detection time of miscellaneous grains. The parameters combination of flash drying temperature, grain size and detection quantity was optimized, and the operation efficiency and detection accuracy of the device were improved. The results showed that the device had good performance, high degree of automation, simple structure and operation, the measurement accuracy, repeatability and reproducibility of the measurement system were reliable, and the relative deviation of detection was less than 0.2%, which provided technical support for the wide application of the rapid moisture meter for the variety of coarse cereals.