The invention discloses a head position attitude measuring apparatus and resolving method for people receiving radiotherapy, comprising a head position attitude measuring apparatus for people receiving radiotherapy and the resolving method for the head position attitude. The technical schemes of the invention are as follows: firstly, obtaining a face image sequence; transforming it into YUV space for threshold division; secondly, according to what has been obtained, performing the coordinate calculation of the face feature points and updating the reference coordinates periodically; then, calculating the displacement amount of the center of gravity of each feature area and recording the center of gravity of the feature point exceeding the displacement threshold; and lastly, according to the statistical features of the center of gravity displacement direction, estimating the head position attitude. The invention reduces the drifting effect of the measurement result, avoids the interference of the ambient light factor to the measured object, avoids the radioactive damage caused by the radiation position determining method, and also gives the quantitative information to the position change caused by the human body shake during radiotherapy.