A horse measuring ruler structure including a vernier main body, a fixing stopper block, two resilient slide blocks, a locating ruler, a locating device, an inner ruler, an outer ruler, a, protective frame and a locking device. The vernier main body is composed of a trapezoid board and two panels rightward extending respectively from middle sections of front and rear sides of the trapezoid board. The upper and lower sections of the right side of the trapezoid board are respectively formed with two T-shaped sockets. The left end of the locating ruler is fitted into the space between the right sections of the panels of the vernier main body and pivotally located by the locating device. The locking device is fitted into the circular receiving chamber of lower end of the inner ruler. The protective frame is fitted onto upper end of the outer ruler and the inner ruler is fitted into the outer ruler. The resilient slide blocks are fitted into the T-shaped cavities of the trapezoid board of the vernier main body. The inner ruler is passed through the space between the front and rear panels of the vernier main body. Two fixing pins are passed through the fixing stepped holes of the front and rear panels, whereby the vernier main body is engaged on the inner ruler by means of the resilient slide blocks.
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