The invention provides a starter operating life monitoring method and device and an engine controller. The method comprises the steps of acquiring the rotational speed of an engine when it is detected that a starter goes into an operating state; acquiring a current operating life model parameter value of the starter when the rotational speed of the starter is greater than a preset rotational speed value; and determining current operating life status information of the starter according to the current operating life model parameter value of the starter. By means of the method, the running safety of vehicles can be effectively improved.