The invention relates to a detector for detecting angular orientation and depth of a pinhole of a camshaft, comprising a base, a stationary center, a rolling center, an angular orientation locating device and a bolt device used for judging whether the phase angle and depth of a detected pinhole meet the requirement. The stationary center and the rolling center are arranged above the base respectively by a stationary center seat and a rolling center seat and jointly determine the datum axis of the axes of the detected camshaft; the angular orientation locating device comprising a V-shaped angular orientation locating block and the bolt device are arranged on the base between the stationary center and the rolling center; and the V-shaped angular orientation locating block is connected with the base in a sliding-fit manner that the V-shaped angular orientation locating block can move up-and-down in a plane vertical to the datum axis. The invention adopts the V-shaped angular orientation locating block to realize bilateral angular orientation locating and reduce impact on locating precision due to the casting shrink of a standard cam peach. The detector can be operated conveniently andthe detection efficiency is high.