The invention relates to a gap adjusting device of a continuous variable valve lift mechanism, and belongs to the technical field of engine components. The gap adjusting device comprises a laser rangefinding sensor, sensor probes, an adjusting bolt grouping pad and a latch; and the sensor probes include long and short probes, one end of the long probe can be cooperated with the laser range finding sensor, the other end of the long probe can be placed in a pedestal calibration hole of the measuring seat and cooperated with the measuring seat, one end of the short probe can be cooperated with the laser range finding sensor, and the other end of the short probe can be placed in a measuring and calibrating hole of the measuring seat, cooperated with the measuring seat and limited by the latch. The invention also discloses an adjusting method of the gap adjusting device of the continuous variable valve lift mechanism. Thus, gap adjustment of the continuous variable valve lift mechanism isrealized, and smooth embarkation, reliable operation and batch industrialization of the mechanism are made possible.