The utility model belongs to the technical field of dial indicator metering, and particularly relates to a mechanism for improving the metering precision of a dial indicator, which comprises a Z-axis bearing seat and a Z-axis motor seat, and a screw rod is rotatably arranged between the Z-axis bearing seat and the Z-axis motor seat; the end, located in an inner cavity of the Z-axis motor base, of the lead screw is provided with a coupler, the end, away from the lead screw, of the coupler is fixedly connected with a core rod, the end, away from the coupler, of the core rod is fixedly provided with a gauge stand, and the installation end of the gauge stand is provided with a dial gauge. According to the mechanism for improving the dial gauge marking precision, the gauge stand is installed on the core rod, the core rod and the lead screw are in linkage connection through the coupler, the coupler and the core rod are additionally arranged, and if the internal space of the Z-axis motor base is not enough to install the gauge stand, the gauge stand can be fixed to the coupler for marking the dial gauge and marking the precision; the problem that the internal space of the Z-axis motor base is not enough to install the gauge stand is solved.