The measuring range of most existing dispersive objective lenses for the chromatic confocal microscopy are on the order of several millimeters. In order to meet the demand for large range linear dispersive objective in the industrial measurement field, a linear dispersive objective with a super large range was designed based on the design principle of linear dispersive objective. It is composed of only five spherical lenses, all of which are made of cost-effective and environmentally friendly optical glasses. The design results show that the axial dispersion of the objective lens is 30.44mm in the wavelength range of 400~700nm, and the dispersion-wavelength linearity is higher than 0.99, which has an excellent linear relationship, and the theoretical resolution can reach 2.034μm.