In some cases of harsh environment, we need to seal zoom telescope in use, and the functions of reversed image and zoom are often integrated into the eyepiece. Which is more conducive to the overall seal design. Therefore, a scheme of the zoom eyepiece of the reversed real image plane in the visible light band is designed. Through the analysis of the initial structure of the eyepiece and the calculation of Gaussian optics, the selected structure is optimized by Zemax software to obtain the zoom eyepiece with three-group and 4×zoom. The position of the entrance pupil keeps constant when the eyepiece is zooming and the exit pupil position changes within 3 mm. The transfer function curve, distortion and chromatic difference of magnification are consistent with the design requirements of the visual optical system. According to the dynamic optical theory, the cam curve is designed with Matlab software, which makes the image plane relatively stable and the focusing smooth in the process of zooming. Although the eyepiece structure is slightly complex, but the optical lenses are spherical, which reduces the overall cost of the eyepiece and makes it easy to process the assembly.