The invention relates to a measuring mechanism, particularly to a mechanism for measuring the depth of a connecting rod bush groove, and belongs to the technical field of measurement. The mechanism for measuring the depth of the connecting rod bush groove includes a base plate, a dial gauge, a gauge stand, and a positioning seat; the gauge stand and the positioning seat are fixed on the base plate successively from left to right; a gauge clamping sleeve is internally provided with the dial gauge; the middle part of the positioning seat is provided with a positioning column capable of floating up and down; the lower end of the positioning column is provided with a spring; the lower end of the spring is provided with a screw-plug; the positioning seat is internally provided with a measuring bar, and the measuring bar is in a clearance fit with a hole of the positioning seat, so that the measuring bar can perform axial motion in the hole of the positioning seat. The mechanism for measuring the depth of the connecting rod bush groove is simple, compact, and reasonable in structure, is accurate in measurement, is high in efficiency, and can quickly measure the depth of the connecting rod bush groove; the measurement is simple and fast, so that the measuring accuracy can be assured, and meanwhile the work efficiency can be greatly improved.