The invention discloses a method and an apparatus for metal three-dimensional printing, in which the method for metal three-dimensional printing comprises the following steps: molten or softened flowable metal is placed in a build area used by a three-dimensional printing device, after having no fluidity, the molten or softened flowable metal is converted into metal built by printing, the molten or softened flowable metal is accumulated on the basis of the metal built by printing, until an object to be printed is built, and the accumulated metal built by printing forms the object to be printed; the key characteristics are as follows: in the building process, the interlayer binding force and the binding force between pixel points are changed through a manner of resistance heating; and a printing area for implementing resistance heating can be set. The metal component generated has high strength, high density, and high building precision, the building process of each pixel point is monitored, a removable auxiliary support can be generated synchronously, a large-scale component can be printed, and the apparatus is simple in structure and low in cost. The present invention possesses a substantial progress.