Rainbow and neon are phenomena formed by sunlight refracting and reflecting in raindrops, which has important research significance. In this paper, solid homogeneous transparent balls with appropriate and equal diameter are used to replace water droplets, and multicolor light source is used to illuminate at an appropriate angle and distance to reproduce the phenomenon of rainbow and neon. On this basis, the experiments of reproducing rainbow phenomenon with single-ball and double-ball and realizing rainbow superposition with multi-ball are carried out respectively. The reproduced rainbow spectrum is measured by spectral analysis technology. The device designed in this paper integrates phenomenon demonstration and parameter measurement, and has important practical application value in optical experiment teaching and popular science education.