A method for regulating continuously variable valve timing of an engine, comprising: a valve timing regulator is parallel-connected in a hydraulic fuel way (6) between a cam cylinder (4) and a valve cylinder (5) of a variable valve mechanism of a hydraulic variable cam follower; the valve timing regulator (7) comprises a valve timing regulator cylinder (8), a valve timing regulator piston (9), a piston resetting apparatus (10), and a limiting apparatus (11); by means of having the piston (9) always kept in a movement in the direction of a zero position by a resetting force generated by the piston resetting apparatus (10), and of having strokes made by the valve timing regulator piston (9) between the zero position and the limiting apparatus controlled by the limiting apparatus (11), the volume of a hydraulic fluid that flows into the valve timing regulator cylinder (8) is controlled, thus controlling timing for the hydraulic fluid to flow into the valve cylinder and an effective-work sustaining angle corresponding to rotation of a cam, and implementing continuous and variable valve timing control. Also provided is an apparatus for regulating continuously variable valve timing of an engine. The method and apparatus allow for increased fuel economy and for improved dynamics and emission reduction of an engine.