Focal point positioning device for astronomical telescope

The invention relates to a focal point positioning device for an astronomical telescope. The focal point positioning device for the astronomical telescope comprises a bearing platform, spectroscope lenses, reflector lenses and three screw rods, wherein the bearing platforms can be rotated around a shaft; the spectroscope lenses are arranged above the shaft; the reflector lenses are arranged on the bearing platform; the three screw rods are arranged on the bearing platform and are distributed at angles of 120 DEG mutually; the screw rods and the reflector lenses are positioned on the same linear optical path and are distributed on both sides of the spectroscope lenses respectively; sliding seats which can be moved back and forth along the screw rods are sleeved on the screw rods; and the spectroscope lenses and the reflector lenses are arranged on the sliding seats respectively through adjustable lens bases. The focal point positioning device is convenient to assemble and carry, focusing light sources can be s