Positioner and digital display brain stereotaxic apparatus

The utility model provides a positioner. The positioner comprises a mounting rod, a clamping device, an illuminator, a mounting table and a convex lens. The clamping device is detachably arranged on the mounting rod in a sleeving mode. The illuminator is detachably mounted to the holder. The mounting table is detachably mounted on the mounting rod. The convex lens is detachably installed on the installation table and can focus light emitted by the illuminator to form a condensation point. The utility model further provides a digital display brain stereotaxic instrument which comprises the locator and a locator body, and the locator is detachably installed on the locator body. According to the positioner, the illuminator and the convex lens are used for replacing a positioning needle, a condensation point can be formed on the surface of the skull, the skull can be directly perforated according to the condensation point, a gap does not need to be kept between the positioning needle and the skull, and a mark pen