Optical structural film and light source module

The invention provides an optical structural film and a light source module. The optical structure film comprises a plurality of optical unit microstructures. Each of the plurality of optical unit microstructures is provided with four side surfaces and a light splitting surface which is concave inwards, the light splitting surface is connected with the side surfaces and is provided with four end points when being viewed from a front view angle, connecting lines of the four end points form a rectangle, and the light splitting surface comprises at least one light splitting curved surface; the junction of the at least one light splitting curved surface and one of the four side surfaces is a first line segment, and the projection of the midpoint of the side line of the rectangle on the light splitting surface is overlapped with the relative extreme point of the first line segment. The optical structure film and the light source module provided by the invention have the effects of thinness and good visual effect a