Abstract: Disclosed is a manufacturing method of a sensor by using 3D printing and 3D printer therefor. According to an embodiment of the present disclosure, a manufacturing method of a sensor by using 3D printing includes: forming a first shape having an inner space by using a non-conductive material, and simultaneously or sequentially, forming an electrode at a preset location in the inner space by using a conductive material; injecting conductive liquid into the inner space; and forming a second shape on the first shape by using the non-conductive material to seal the inner space of the first shape.