Groove-width check tool

The utility model discloses a groove-width check tool, comprising an amesdial, a slide bar and a carriage arranged on the slide bar. The carriage is provided with a rigid spring body which is divided into two parts of a fixing piece and a measuring piece by an elastic fixing part in the middle. One end of the measuring piece extends out of the carriage and a measuring ball is arranged on the end. The amesdial is arranged on the fixing piece with the measuring end of the amesdial contacting to the other end of the measuring piece. The utility model has the advantages that the groove width of the part can be checked conveniently by using the groove-width check tool which is simple to operate and has definite commonality, which ensures the accuracy of the experimental data and the production quality.