The invention discloses a three-dimensional moving support and a 3D printing device composed of the same. The three-dimensional moving support comprises an X-direction moving mechanism, a Z-directionmoving mechanism and a Y-direction moving mechanism. The X-direction moving mechanism is horizontally arranged, the Z-direction moving mechanism is mounted at the drive end of the X-direction moving mechanism, the X-direction moving mechanism drives the Z-direction moving mechanism to move in the left-and-right direction, the Y-direction moving mechanism is mounted at the drive end of the Z-direction moving mechanism, the Z-direction moving mechanism can drive the Y-direction moving mechanism to move in the up-and-down direction, and the Y-direction moving mechanism can drive the drive end ofitself to move front and back. The three-dimensional moving support is simple in structure, the Z-direction moving mechanism is driven by the X-direction moving mechanism to move in the left-and-rightdirection, the Y-direction moving mechanism is driven by the Z-direction moving mechanism to move in the up-and-down direction, the Y-direction moving mechanism can drive the drive end of itself to move in the front-and-back direction, and therefore the drive end of the Y-direction moving mechanism can do three-dimensional motion.