The invention relates to a healthy diet evaluation system based on IOT (internet of things) information processing. The system comprises an electronic scale and a smart mobile device, wherein the electronic scale comprises a single chip microcomputer, a weighing module, a liquid crystal display and a wireless communication module, the single chip microcomputer is connected with the weighing module, the wireless communication module, the liquid crystal display and a pressure sensor, and the mobile device wirelessly receives data transmitted by the wireless communication module. According to the system, management and analysis of nutrition data are realized, therefore, a user has a specific concept about the total number of everyday intake calories and nutrition of each kind of food, can calculate intake and consumed calories every day and changes a qualitative diet habit into a quantitative diet habit; and according to the system, data transmission is reliable, the structure is simple, the cost is low, and convenience is brought to the user.