The invention provides a simulation platform based specialist smart diagnosis system for a waste incineration plant. The system includes a data collection system used for collecting field control platform data of the waste incineration plant; a simulation platform receiving the field control platform data and receiving a control command and performing simulation and displaying through a simulationmathematics model, wherein the simulation mathematics model is a simulation model formed through mathematical modeling according to a controlled plant device of the waste incineration plant; a specialist diagnosis system receiving the field control platform data collected by the data collection system and simulation data after simulation calculation through the simulation mathematical model by the simulation platform, performing data analysis and diagnosis and calling a knowledge base of a specialist base server to generate information or a task list. According to the invention, personnel training can be realized through offline simulation and comparison between practical production data and theoretical calculation data of the simulation platform can be realized online, so that accidentscan be avoided and production efficiency is improved.