The invention discloses an abnormal-shape window pasting machine. The abnormal-shape window pasting machine comprises a machine frame and a conveying channel arranged on the machine frame and used for conveying paperboards. A paperboard feeding mechanism, a scrapping printing gluing mechanism, a film pasting mechanism and a film pressing mechanism are sequentially arranged on the conveying channel; the film pressing mechanism comprises a film feeding device and a film absorbing pressing device for absorbing films for being attached to paperboards; the film feeding device comprises a containing channel for containing films, a film front stopping sheet arranged on the containing channel and used for abutting against films, a back pressing device for pressing films and two side film jacking devices; the back pressing device is located between the two side film jacking devices, and the film front stopping sheet is arranged at one end of the containing channel; the back pressing device and the two side film jacking devices press films to abut against the film front stopping sheet. In the film adding process, films are consistently pressed and positioned, operating is convenient, films are added in the pressing process, and the effect that films are added without stopping is achieved.