The invention discloses a measurement mechanism-based credible PLC starting method. The measurement mechanism-based credible PLC starting method comprises the following steps: performing firmware verification initialization; reading firmware information for calculating PLC; performing one-by-one verification and storage; performing operating stating stage verification. The method provided by the invention adopts an industrial-grade chip with a trusted function as a hardware calculation core, the PLC extends the Flash bus to be loaded by the hardware of the method provided by the invention, the hardware of the method provided by the invention identifies necessary starting information, the necessary starting file of the PLC system is subjected to integrity verification by an integrity verification method, and the PLC system is guaranteed to be in a credible state after being started. By the method, a safe and credible industrial control system operating environment can be built on the basis of guaranteeing the accuracy and the practicability of terminal equipment safety.