To provide a separation device capable of being separated with the separation width set in advance in asphalt separation work, at the same time, cutting a section finely and quickly and efficiently treating asphalt work.

The front of an asphalt separation device is equipped with a front cut section 5 having the downward front end and provided nearly on an asphalt surface, the rear thereof is equipped with a carrier conveyor 14 receiving asphalt 3 to be separated to convey it backward, and the asphalt is separated in a movable manner and the front end of the front cut section 5 is equipped with a separation device 6a projected approximately forward to separate the asphalt 3, and both ends of the front cut section 5 are equipped with a cutting device 6b approximately forward and cutting the asphalt so as to make it possible to make it possible to adjust the cutting width and an angle adjusting device 7 for adjusting directions of separation of the separation device 6a and cutting device 6b, and separation work of the asphalt 3 is carried out.