An embodiment of the utility model provides an exchange extra -high voltage GIS's state evaluation device based on multisource data, include: acquire the detection data that exchange among the extra -high voltage GIS each blocking part spare and predetermine the quantity of state, detect data including electrified data and/or the on -line monitoring data of detecting to and stop the data acquisition module of electric test data, with data acquisition module links to each other, according to detect data and predetermine the quantity of state standards of grading, it is right the state that exchanges each blocking part spare of extra -high voltage GIS is grade, and according to the evaluation as a result of grading exchange the first evaluation module of the state grade of each blocking part spare of extra -high voltage GIS, with first evaluation module links to each other, according to exchange the state grade and the predetermined interchange extra -high voltage GIS evaluation criterion of each blocking part spare of extra -high voltage GIS, assess the module is assessd to the second that exchanges extra -high voltage GIS's global state grade. Satisfy the actual demand more, strengthened accuracy and validity to exchanging the evaluation of extra -high voltage GIS state.