The invention relates to a chemical engineering device operating state scoring method, and mainly solves the problem that in the prior art fault monitoring is uncertain in result. The problem is well solves by the technical scheme that the chemical engineering device operating state scoring method comprises the steps that, chemical engineering device real-time data enters a technological operating state scoring system, and the current technological state is determined according to a fault monitoring algorithm model based on PCA (Principle Component Analysis); a new comprehensive fault monitoring index is formed in the fault monitoring algorithm model based on PCA; the chemical engineering device operating state scoring method can be applied to the scoring of the operating state of the chemical engineering device.