The invention relates to an accurate positioning 3D printer. The accurate positioning 3D printer comprises a base, a support plate, a printing platform, a printing head, an X-axis movement mechanism, a Y-axis movement mechanism and a Z-axis movement mechanism, wherein the X-axis movement mechanism comprises a first motor, a first bottom plate, a first baffle, a first screw rod, a first limiting rod and a first sliding block, the Z-axis movement mechanism comprises a second motor, a second bottom plate, a second baffle, a second screw rod, a second limiting rod and a second sliding block
assembly, the second sliding block
assembly comprises a second sliding block, a correction unit and a
control unit, and the Y-axis movement mechanism comprises a third motor, a third bottom plate, a third baffle, a third screw rod, a third limiting rod, a third sliding block and an adjustment
assembly. According to the accurate positioning 3D printer, the positioning accuracy of a Y axis and a Z axis is increased, the adjustment assembly is additionally arranged in the Y-axis movement mechanism, so that the horizontal accuracy of the Y axis can be increased, and the
control unit and the correction unit are additionally arranged in the Z-axis movement mechanism, so that the
vertical displacement of the Z axis is stable and accurate.