Abstract: Bananas have the characteristics of high moisture content and dense fiber distribution. In order to solve the problems of traditional straw-returning machinery， such as incomplete crushing， easy-to-wear and clogging of crushing tools during the return of banana straw to the field， in our report， a compact structure of the soil-covered straw crusher returned to the field was designed， which has the straw dehydrator， the straw screen， and the serrated shredder set， and can complete the dewatering and crushing of straw at the same time and perform two soil covering operations. The analysis results of the movement and stress of the straw crushing process indicated that the maximum absolute speed of the blade end point is about 7.87 m/s， which can meet the requirements of the crushing operation； the stress distribution of the cutter in the working area is relatively uniform， and the deformation is about 2 mm， the designed cutter structure and selected materials can ensure reliable work.