A knife connector includes a base, a cover, a clamping device and a connecting stub. The base has a holding side, a knife-holding end, a connecting end opposite to the knife-holding end and a holding cavity. The holding cavity is defined in the holding side and has an opening defined in the knife-holding end. The cover is pivotally connected to the base to close the holding cavity. The clamping device is mounted on the base and holding the cover on the base to close the holding cavity. The connecting stub is mounted on the connecting end of the base and has a non-circular cross section and an engaging recess defined around the connecting stub. Accordingly, the knife connector can detachably and changeably connect a blade body to a handle to fit with different kinds of cutting tools.