The existing chestnut husker is not adapt to chestnuts just at the point of maturity, which is timeconsuming and inefficient, and even seriously restricts the development of chestnut industry. In order to overcome the chestnut husker with the shortage of high damage rate and low removal rate which are commonly used in the market presently, a chestnut husker was designed which can not only rub and peel the chestnut flexibly, but also screen the chestnut with reciprocating motion. The design of the key parts, including the bidirectional screening device part and the transmission system, was described in detail. The upper end of the bidirectional screening device was considered as the chestnut fruit export which was higher than the other end. The lengths of both the rubbing rubber plate and the rubbing arm can be adjusted to fit the chestnut thorn ball with different sizes. We produced more than 20 prototypes. The results of prototype experiment proved that the machine can meet the requirements of actual production. The tests for the chestnut thorn balls which are closed to maturity were conducted and the results proved that the threshing rate was more than 96%, the separating rate was more than 98%, and the loss rate was less than 4%.