Focusing device for primary focus telescope

The utility model discloses a focusing device for a primary focus telescope, and particularly relates to the field of astronomical telescopes, which comprises a telescope main body, an objective lens is arranged on one side inside the telescope main body, and a fixed ring body which is in sliding fit with the inner wall of the telescope main body is fixedly sleeved on the circumferential side wall of the objective lens. According to the utility model, the adjusting device is arranged, the moving assembly is pulled by a hand to drive the moving plate to move rightwards through the limiting assembly, meanwhile, the adjusting assembly is driven to move rightwards through the moving plate, the moving plate drives the sliding block to move rightwards, the sliding block drives the objective lens and the fixed ring body to move rightwards synchronously, and preliminary adjustment of the objective lens is realized; according to the technical scheme of the utility model, the movable plate is horizontally adjusted thro