The invention belongs to the field of unmanned aerial vehicles, and particularly relates to an oblique photography aerial camera device. The oblique photography aerial camera device comprises an uppershell, a lower shell, a camera group, and a functional module unit arranged between the upper shell and the lower shell; a projecting fixing groove is formed below the lower shell to accommodate thecamera group; the camera group comprises a positive photography camera with a curtain being parallel to the plane of the lower shell, and four oblique cameras arranged on the circumference of the positive photography camera; included angles between the curtains of the oblique cameras and the plane of the lower shell are alpha, and alpha is more than or equal to 30 degree and less than or equal to45 degrees. The oblique photography aerial camera device is carried on a consumer grade unmanned aerial vehicle (such as Wizard 4), so that a single person can carry an oblique operation system, reacha specified operation region, and carry out oblique photography work in the specified region. Thus, tasks can be accomplished quickly, efficiently and accurately.