The invention relates to the field of air traffic control radar and discloses a pitching mechanism for an air traffic control radar antenna. The pitching mechanism comprises a fixing frame, wherein afixing portion on the fixing frame is fixedly connected to the radar antenna; an arc curved portion on the fixing frame is sleeved with a pitching mechanism; convex teeth are disposed on the inner side of the curved portion; stepped surfaces are symmetrically disposed on the inner side wall of the curved portion located on both sides of the convex teeth; a stopping groove is disposed on the outerside wall of the curved portion; the pitching mechanism includes an arc upper casing and an arc lower casing; the upper casing and the lower casing are fixedly connected by lock nuts on edges. First and second rollers perform rolling friction on the curved portion, so that the upper and lower casings are not in contact with the curved portion. Further, the first and second rollers are made of nonmetallic materials such as rubber and the like so as to reduce the friction during the operation of the pitching mechanism and improve the transmission efficiency of the pitching mechanism.