Abstract: In order to realize high-efficiency, low energy-consumption and high burying rate in the requirements of mechanized ploughing operation for economic green manure crops, a GFY-200 type crushing and overturning combined machine for economic green manure crops was designed, and then the structural and technical parameters of the key components such as the crushing and overturning component, the encloser trailing bar component and the powered roller component were designed. The overturning experiments of four kinds of economic green manure crops in summer and winter, such as black bean, indian cowpea, cassia seed and Astragalus smicus were carried out by the machine, the results of field overturning experiments showed that with the operation speed of 2.5～3.0 km/h, the rotation speed of knife roller was 387 r/min, the average overturning depth of the four economic green manures was 16.9 cm, the qualified rate of the average crushing length of the economic green manure stalks was 82.35%, the average coverage rate of the economic green manure crops was 93.28%, the designed crushing and overturning combined machine for economic green manure crops could work efficiently up to 0.67～1.0 hm~2/h, the tested indexes met the requirements of national and industrial standards, which was obviously superior to the conventional overturning modes such as animal plough, mouldboard plough and rotary tiller in terms of overturning quality and the combination pattern. With the operation of this machine, the soil moisture conservation effect was increased, while the fertilizer effect of green manure crops was improved at the same time, which would have a good popularization and application value.