The invention provides an ink-jet position adjusting method and three-dimensional printing equipment. The ink-jet position adjusting method comprises the following steps that a three-dimensional digital model is acquired, and the three-dimensional digital model is subjected to layer-cutting treatment, so that a layer-cutting object with a cross-sectional profile is generated; a normal direction ofthe object surface corresponding to the layer-cutting object is acquired from the three-dimensional digital model; when the normal direction points to the negative direction of the first axial direction, the surface inclination degree of the object surface corresponding to the layer-cutting object is acquired, and the neck-in of the ink jet position of the layer-cutting object is calculated according to the surface inclination degree; the ink jet range of the layer-cutting object is acquired according to the neck-in and the cross-sectional profile; and after controlling a printing module to print the layer-cutting object, an ink-jet module is controlled to face the layer-cutting object according to the ink-jet range.