The utility model relates to a novel roll changer of the work roll, which is used in the medium and heavy plate production line of a large iron and steel corporation as equipment for changing the work roll of the mill. The roll changer is composed of a body, an orbit, a driving device and a roll changing trolley. The structure of the roll changer is that the body is composed of a first body and a second body which are arranged on the fixed orbit on the both sides at the front of the roll changer and driven by a first transverse cylinder and a second transverse cylinder; the roll changing trolley is installed on the opposite of the work roll. The orbit is composed of a moving orbit and a fixed orbit; the moving orbit is controlled by an orbit position controlling cylinder, which can be connected with the fixed orbit to be a whole or be a right angle to be taken back. The utility model has features of novel structure, shortening the change time, less land occupied, low weight and saving investment, so which belongs to a novel roll changer of the work roll with economy and practicality together.