Fast multi-sintering additive manufacturing device and method

The invention discloses a fast multi-sintering additive manufacturing device and method. The fast multi-sintering additive manufacturing device comprises a powder bed subsystem, a surface sintering subsystem and a line sintering subsystem, wherein the three subsystems are mounted on a frame. The fast multi-sintering additive manufacturing method includes the following steps that 1, each layer of forming area, namely the sintering area, is divided into a surface sintering area and a line sintering area surrounding the surface sintering area; 2, a heat radiation source is arranged above a powder bed; 3, a layer of forming powder is laid on the powder bed; 4, the line sintering areas are formed through sintering on the layer of forming powder; 5, the absorption rate of part of the area of working layer forming powder to radiation of the heat radiation source is changed; 6, a layer of forming powder is laid on the powder bed again to form the working layer forming powder; 7, the line sintering areas are formed through sintering on the layer of forming powder; 8, the absorption rate of the working layer forming powder is changed; and 9, the step 6 to the step 8 are repeated till the whole forming process is completed. The fast multi-sintering additive manufacturing device and method have the advantage that surface sintering and line sintering are combined, so that the forming speed is increased, and the forming precision is guaranteed.