The invention relates to a locating jig of a laminator. The locating jig of the laminator comprises a base plate and a locating plate. The base plate and the locating plate are fixed together through a fixing frame. An ejector pin air cylinder is further fixed to the bottom face of the base plate. The two sides of the upper surface of the locating plate are provided with multiple pairs of film flow channel limiting blocks. Multiple vacuum air intake holes and multiple locating holes are further formed in the middle of the upper surface of the locating plate. Locating pins are arranged in the locating holes. The ejector pin air cylinder is connected with the locating pins in a driving manner. Jig sliding sleeves are arranged between the base plate and the four corners of the locating plate. The bottom face of the ejector pin air cylinder is further provided with an ejector pin height adjusting valve used for controlling the ejection height of the locating pins. According to the locating jig of the laminator, the whole laminating position is guided and aligned according to locating holes of a film; and in the laminating process, the film is always in a free state, the film is free from a length change caused by stretching, so that the precision of the laminating position is high, the manufacturing process is stable, and the yield of products is greatly improved.