On -vehicle bicycle roof -rack, including all along controlling front beam and the rear frame member that the horizontal direction set up, the both ends lower part of front beam and rear frame memberall is provided with the jack catch of fastening connection on two roof poles in the car roof portion, and the horizontal direction slides and is provided with the two sets of handlebars location installation component who is used for fixing the handlebar of bicycle about following on the front beam, and the horizontal direction slides and is provided with the two sets of rear wheels location installation component who is used for fixing the rear rim of bicycle about following on the rear frame member. The utility model discloses fully consider the characteristic of vehicle movement process, with the bicycle upset back of standing upside down, the approved car is always driven a vehicle uniting the positioning lock with the rear rim, has that reliability of positioning is strong, focus greatly reduced, ensures the stability the when vehicle is marchd and is turned at a high speed. The utility model discloses the locating clip that only needs one person's alright whole bicycle of completion is tight, simple to use, need not dismantle the wheel, and many bicycles are convenient for arrange in harmless installation.