Embodiments of the invention disclose an easy-to-use automatic tool anchor capable of accurately measuring neck-in. The automatic tool anchor comprises a tool anchor clamping piece, a fixed plate anda tool anchor plate, wherein the tool anchor clamping piece comprises a cone and a stop dog connected with one end of the cone; the stop dog extends out from the cone along the radial direction; the stop dog is butted with the fixed plate; and the cone passes through a through hole in the fixed plate and is inserted into a cone hole of the tool anchor plate. The automatic tool anchor is characterized in that the tool anchor clamping piece further comprises a measuring head connected with the stop dog; and the easy-to-use automatic tool anchor capable of accurately measuring neck-in further comprises a displacement sensor corresponding to the measuring head. The tool anchor clamping piece of the automatic tool anchor capable of accurately measuring neck-in adds the measuring head on the stop dog on the existing basis, correspondingly arranges the displacement sensor on the automatic tool anchor to be matched with the measuring head for using, and utilizes the displacement sensor to measure the displacement of the tool anchor clamping piece, so that compared with measuring sleeves, the measuring head has the advantage that the measuring precision is greatly improved.