A viewing angle adjustable vehicle camera device comprises a housing, a camera module and an adjustment tenon. The adjustment tenon is disposed behind the camera module to adjust the viewing angle of the camera. The housing is formed with an adjustment slot and a mounting unit for mounting of the adjustment tenon, and the adjustment tenon is movable along the adjustment slot and capable of being fixed to the mounting unit, so that the position of the camera module can be adjusted easily to obtain an optimum viewing angle.