Metal additive manufacturing powder bed preheating device

The utility model discloses a preheating device for a metal additive manufacturing powder bed, which relates to the field of metal additives and comprises a first sliding block slidably connected in a first notch, a movable block fixedly connected to one side, far away from the inner wall of the first notch, of the first sliding block, and a box body fixedly connected to one side, close to the inner wall of a box body, of the movable block. The two box bodies are symmetrically arranged about the center of the movable block, first springs are fixedly connected into the box bodies, compression blocks are fixedly connected to the ends, away from the inner walls of the box bodies, of the first springs, and a fixed box is fixedly connected to the side, away from the inner wall of the box body, of the movable block. According to the preheating pipe dismounting device, the box body is separated from the fixed box by pressing the compression block, so that the handle is pulled, the preheating pipe can be taken out to