Engine parameter correction method and engine

The invention belongs to the technical field of engines, and discloses an engine parameter correction method and an engine, and the engine parameter correction method comprises the following steps: S1, according to an abrasion loss MAP table of a valve mechanism, calculating to obtain an accumulated abrasion loss of the valve mechanism under an actual working condition; s2, according to the accumulative abrasion loss, the actual valve timing phase change amount is calculated; and S3, according to the fuel injection advance angle correction coefficient MAP table, the fuel injection quantity correction coefficient MAP table and the urea injection quantity correction coefficient MAP table, the actual gas distribution phase change amount is input, the fuel injection advance angle correction coefficient, the fuel injection quantity correction coefficient and the urea injection quantity correction coefficient are obtained through table look-up, and the nozzle advance angle, the fuel injection quantity and the urea