The utility model provides a threshing device which is beneficial for carrying out the operations related to the operation of guiding reaped grain straw from a feeding device to an entrance guide path of a threshing chamber. The entrance guide path is composed of an entrance guide bottom wall body (50), a left side wall portion (60) and a right side wall portion (70), the left side wall portion (60) is arranged in the left side wall of a threshing machine body and arranged on one side of the width direction of the entrance guide bottom wall body (50), the right side wall portion (70) is arranged in the right side wall of the threshing machine body and arranged on one side of the width direction of the entrance guide bottom wall body (50), the entrance guide bottom wall body (50) is obliquely arranged below the spiral portion on the front end side of a threshing barrel, and the closer the entrance guide bottom wall body is to the side of the threshing chamber, the larger the arranged height of the entrance guide bottom wall body is. The entrance guide bottom wall body (50) is supported to be freely assembled and disassembled. The left side wall portion (60) and the right side wall portion (70) are supported to be freely assembled and disassembled.