The invention relates to a full-automatic 30-magnification object lens for a urine visible analyzer, belonging to a medical 30-magnification microobjective and comprising a lens group and a mechanical structure assembly, wherein the lens group forms an optical system of the microobjective and comprises a negative balsaming lens group I, a balsaming lens group II, a balsaming lens group III, a meniscus lens and a thick lens and includes 8 lenses; and parallel light passes through the optical system of the microobjective and then is focused on a specimen to be tested, and the maximum view field is phi 26mm. while function perfection is ensured, higher shooting speed and more specimen cell details in comparison with the traditional 20-magnification objective can be provided, thus information contents are increased, and better processing property is achieved.