The invention discloses a preparation method of an erlotinib intermediate, i.e., 3-aminobenzeneacetylene. The method comprises the following steps of: performing a Vilsmeier reaction on 3-nitrobenzene ethyl ketone (I) serving as an industrial raw material to obtain an intermediate, i.e., 1-chloro-1-(3-nitrobenzophenone)-2-(N,N-dimethyl formaldehyde oxime)-yl-ethylene (II) containing a halogen-substituted alkene bond; performing a dehydration reaction to obtain a formyl intermediate, i.e., 1-chloro-1-(3-nitrobenzophenone)-2-formaldehyde)-yl-ethylene (III); performing an elimination reaction to obtain an intermediate, i.e., 3-nitrophenylacetylene (IV); and performing a nitro reduction reaction on the intermediate, i.e., 3-nitrophenylacetylene (IV) to obtain the erlotinib intermediate, i.e., 3-aminobenzeneacetylene (intermediate A). The preparation method can contribute to improving the atom economy, process simplicity and environment friendliness, so that the the erlotinib intermediate, i.e., 3-aminobenzeneacetylene can be prepared easily and conveniently.