The invention discloses a multiple-angle and double-camera oblique photography device and system, and belongs to the field of unmanned planes. The multiple-angle and double-camera oblique photography device comprises an aerial photography head and an aerial survey unit, and the aerial photography head is connected with the aerial survey unit and can drive the aerial survey unit to rotate in a vertical plane and a horizontal plane; and supporting plates and cameras are symmetrically arranged at the center of the aerial survey unit, the cameras are arranged at the outer ends of the supporting plates, and an included angle between the two cameras is 35-70 DEG. The aerial photography head can control the aerial survey unit to have two shooting postures, and the oblique angles of the two angles are same at the first posture; and the aerial survey unit has the second posture after the rotating shaft of a second steering engine in the aerial photography head rotates, and one of the two cameras is positioned in a vertical shooting position. The device adopting double cameras has the advantages of great reduction of the weight, improvement of the cruising ability, realization of a high shooting repetition rate, and guaranteeing of the accuracy of three-dimensional modeling.