The invention discloses a vertical film laminating device based on a V-method casting die. The vertical film laminating device comprises two sets of vertical negative-pressure boxes of which absorption surfaces are opposite; a gap for storing the die is remained between the two vertical negative-pressure boxes; a plastic thin film for laminating the die is adsorbed on the absorption surface of each vertical negative-pressure box; electric heating tubes are arrayed in the vertical negative-pressure boxes; the vertical negative-pressure boxes are further connected with a vacuumizing system; the vacuumizing system is communicated with the inner part of the die through a vacuum pipe. The invention provides the vertical film laminating device based on the V-method casting die, fills in the blank of die film lamination in a V-method process, and does sufficient preparation work for subsequent mold sand forming; film laminating is carried out on the die by adopting a vacuumizing manner and the plastic thin film is heated by the electric heating tubes, so that the die can be laminated under the condition that the plastic thin film is at a plastic state and the laminating effect is good; the vertical film laminating device has a relatively high automatic working potential and provides a wide development space for a V-method production process.