The present invention relates to a head for a 3D printer having a dual nozzle capable of adjusting the vertical height of an output nozzle, in which dual nozzles are provided separately to move up and down in a sliding way and discharge filaments, respectively. The 3D printer having a dual nozzle capable of adjusting the vertical height of an output nozzle by the present invention comprises: a main motor (100); a center gear (200) which is provided at one side of the main motor (100) and rotates according to the rotational power of the main motor (100); a left gear (202) and a right gear (204) which are provided on the left and right sides of the center gear (200), respectively and selectively force the pair of filaments (210, 210′) to move downwards respectively in close proximity to the center gear (200); a pair of nozzle assemblies (300) which each heats the pair of filaments (210, 210′) supplied downwards by the left gear (202) and the right gear (204) and discharges the filaments to the outside; a control member (400) which supports the left gear (202) and the right gear (204) to be rotatably installed; a control means (500) which forces the control member (400) to move from side to side; and an operation member (600) which forces any one of the pair of nozzle assemblies (300) to move downwards in accordance with the left and right movements of the control member (400). The present invention as described above has an advantage of improving work quality and work efficiency.
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