Expression language design method suitable for low-code products

The invention relates to an expression language design method suitable for a low-code product, which can be implemented in a message center of an Internet of Things operating system, and developers usually have the requirements of processing and converting a large amount of data through low-code development. In order to improve the development efficiency of low-code products during data processing, an expression language is realized, common operations such as valuing, calculation, comparison, logic and method calling are supported, and data processing and conversion can be conveniently realized. According to three common application scenes of expression languages in low-code products, namely data processing, templates and SQL (Structured Query Language) statements, simple expression grammar meeting practical requirements is defined, and an expression statement parser tool which is ready to use after box opening is provided. The learning and development cost in the use process of the low-code product is reduce