The purpose of this study is to develop the STEAM teaching model and program based on smart device for connection of kindergarten-elementary school. We reviewed literature related to STEAM education and smart devices, developed the teaching model, and verified the validity of experts. This teaching model was applied for 15 weeks to 23 children aged 5-years and 45 children aged 7-years. After modifying and supplementing the application process analysis results, the STEAM teaching model based on smart device was finally developed. On the basis of the result of pilot testing, this teaching model was modified and finalized. The purpose of developing the STEAM teaching model based on smart device for young children aged 5 and 7-years was to increase their interest in and awareness of STEAM, creativity, and convergent thinking ability. As for the operation method, STEAM classes were planned and executed, plans were revised and re-executed according to the STEAM class standards for connection of kindergarten-elementary school. The purpose of developing the STEAM teaching model based on smart device for young children aged from 5-years to 7-years was to increase their interest in and awareness of STEAM, creativity, and convergent thinking ability. The STEAM teaching model based on smart device for connection of kindergarten-elementary school is 3 times of present situation, creative design and emotional experience for content convergent, and conclusion on problem solving. The STEAM program based on smart device for connection of kindergarten-elementary school developed a total of 8 activities. In the early stages of the application of smart device-based STEAM education, the development of a smart device-based STEAM class model can provide implications for connection of kindergarten-elementary school.