The subject innovation relates to a screw grinding device. In the thread grinding apparatus for the present design it is, polishing processing screw portion formed on the shaft member, and a base member; At least two support members to be erected with the forward and backward a predetermined distance fixed to the upper surface of the base member; Screwing with one of the support member and the other support member and is coupled to the slide rotation rotating member with a fixed chuck so as to secure the shaft member for the threaded grinding the anti-rotation key-coupled to the front end thereof and; In turn been close proximity to the threaded portion of the shaft member is coupled to the fixed chuck according to the driving force that the grinding wheel grinding a threaded portion which advances and retreats by the rotary member, characterized by configured to include. The present design as in the above, there is an effect that a precision grinding wheel during grinding processing after the processing of the threaded portion on the shaft member to polish the bone between the pitch and the pitch of the screw.