The invention relates to a manufacturing method for a window prism used for collecting palm (finger) prints, which comprises processes such as hanging, milling, grinding, secondary hanging, secondary milling, secondary grinding, polishing, washing, edge chamfering, detecting package rotation, film coating, and the like. By adopting cold glue and water gel to finish the combination of spare parts and a high-accuracy glass frock, the angular accuracy error of the processed spare parts is ensured. By adopting a plane laser interferometer in field detection, optimal surface shape accuracy can be obtained, thus solving the distortion problem of the optical imaging of the collected objects, ensuring the restoration degree of the collected objects and reducing the probability of wrong recognition of palm (finger) prints. By additionally plating a broadband anti-reflection coating onto a light admitting surface of the window prism, the bandwidth reaches 400 - 900nm. By additionally plating a high-hardness film onto the surface of the anti-reflection coating, the problems of small transmission amount of the image collection window prism, existence of unneeded stray light, and easy scratch and dirt remain on the window prism surface are solved.