Self-locking bolt for measurement instrument while drilling

The utility model provides a selflocking bolt of a measuring instrument while drilling for fixing parts of the measuring instrument while drilling of a horizontal well, which consists of a fixed separation blade, a fixed snap spring and a screw body, wherein a hexagonal socket inside a notch is arranged on a top cap of the screw body, a groove is arranged at the outer edge at the upper part of the top cap, the fixed snap spring is pressed inside the groove of the top cap of the screw body to be tamped, after the top cap of the screw is looped by the fixed separation blade, the groove of the top cap of the screw body is knocked and tamped so that the fastened screw body fixes the part to be connected with the instrument. The utility model solves the problem of the prior art that the fixed bolt is easily loosened in high intensive vibration so that the measuring instrument while drilling is easily damaged because the instrument is used for a drilling site, and the utility model can be widely applied to the oper