Physical simulation about the crystal growth of the continuous casting solidification unit was implemented to study the influence of superheat degree on solidification structure and carbon macro-segregation of 60Si2MnA spring steel. Compared with numerical simulation and actual solidification structure, the solidification structure of the experimental simulation has similar area ratio of equiaxed structure and grain size, the experimental results indicate that experimental simulation solidification structure is in agreement with actual one. With the superheat increase, the columnar length increase and equiaxed length decrease. In addition, the 60Si2MnA spring steel presents carbon negative segregation at the initial solidification zone and positive segregation at the end solidification zone in the process of solidification, and carbon positive segregation is found to be more severe with superheat degree increasing.