The utility model relates to an inclination angle measuring apparatus under two -way power take off aggregate unit and antenna, including the input shaft, a drive mechanism, a drive mechanism include first ring gear, act on second gear and the first planet carrier of being connected with coaxial first gear, the gear -type one -tenth of first ring gear, secondary drive mechanism, secondary drive mechanism include with the fixed transmission of first planet carrier is connected first rotate and with the first second that the formation effect is connected a rotation piece that rotates, the 3rd drive mechanism, the 3rd drive mechanism including install the second planet carrier that rotates in the second, install in the epaxial third gear of input and with third gear engaged with fourth gear, control the first rotation direction of piece and the rotation in the opposite direction's of second rotation piece the one -way control mechanism of rotating. This inclination angle measuring apparatus under two -way power take off aggregate unit and antenna can realize the independent accurate control of the beam antenna's more than two or two the angle that has a down dip, and compact structure, whole size are little.