The present invention is provided on the engine body for providing a certain space therein, the upper plunger is elevated can be installed on the upper side of the main body, it is provided on the lower side of the upper plunger lower plunger for lifting the upper plunger and the upper plunger the elevated above the top of the chamber along as installed on the outer periphery of the chamber, the chamber in which the working oil flows is provided in the circulation conduit, the chamber connecting the upper portion of the chamber bottom and the chamber and the upper plunger is elevated as opening and closing part for opening and closing the circulation flow to be placed in a logical turn valve, and the circulation flow passage which to communicate with the lower portion of the chamber, or cut off and the upper is in communication or blocked in the chamber bottom and the chamber, the controller for controlling the opening and closing portion, and it is connected to the controller and including a sensor for measuring the load of the engine, Wherein the controller relates to an engine variable valve timing apparatus, characterized in that for controlling the opening and closing portion so that the circulation passage is opened and closed depending on the addition of the engine measure the load sensor.