The invention discloses a distributed type heating device applied to 3D printing and a control method thereof. The distributed type heating device mainly comprises a printing base plate, bus type temperature measuring units, heating resistors and a controller. A printing model can be placed on the printing base plate, the printing base plate is subdivided in a gridding mode, and all grids are composed of the bus type temperature measuring units and the heating resistors. A heating function of the printing base plate is controlled by the controller, and the controller supplies power to the heating resistors for heating through control wires. The bus type temperature measuring units are used for measuring the temperatures in the grids of the printing base plate, and detected temperatures are transmitted to the controller through a bus. The controller compares actual temperatures and a set temperature so as to control the heating resistors to continue heating or not. According to the distributed type heating device, the problem that an existing 3D printer is not even in heating is solved; buckling deformation and other problems in the printing process of the model can be prevented, and heating can be carried out as needed according to the shape of the model, so that energy sources are saved.