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The utility model discloses a tooth holder mould drawing tray device of adjustable size, including operation handle, U type tray and adjusting component, operation handle is connected in the middle part of U type tray back, adjusting component includes support block, left pull rope, right pull rope and pull component, support block is located in the middle part in U type tray, and its left end surface has left through hole, and its right end surface has right through hole, and the rear end of operation handle is forward and has the pull channel that extends to the inside of U type tray and the inside of support block and is connected with left through hole, right through hole, pull component is located in the rear end of pull channel, and left pull rope and right pull rope are all worn in pull channel, and the rear end all is connected to pull component, and the front end of left pull rope is worn and is connected to the left front part of U type tray through left through hole, and the front end of right pull rope is worn and is connected to the right front part of U type tray through right through hole, effect: not divide medium, small size model, only set up a application to be used for the patient of different size of dental arch left and right size, and use cost greatly reduces, and make use of adaptability and use versatility are strong.