Engine oil pressure monitoring method and device and engine monitoring system

The invention provides an engine oil pressure monitoring method and device and an engine monitoring system.The method comprises the steps that the current rotating speed and the current circulating oil amount of an engine are obtained, the current circulating oil amount is the circulating oil amount collected at the current moment, and the circulating oil amount is the fuel oil amount consumed when the engine runs for one stroke; inquiring a first mapping relation according to the current rotating speed and the current circulating oil quantity to obtain a target engine oil pressure reference value, wherein the first mapping relation is a mapping relation among the current rotating speed, the current circulating oil quantity and the engine oil pressure reference value; a current engine oil pressure value of the engine is obtained, and a pressure deviation value is calculated according to the current engine oil pressure value and the target engine oil pressure reference value; and when the pressure deviation va