Disclosed are a wire grid polarizer and a manufacturing method thereof, and a display device, which relate to the display technical field. The problem of high production cost in a manufacture process of a wire grid polarizer can be solved. The manufacturing method of the wire grid polarizer includes: coating a first polymer monomer on the surface of the base substrate; subjecting the first polymer monomer corresponding to the first preset position to a curing treatment; forming a pattern of first protrusions with intervals on the surface of the base substrate; coating a mixture of the second polymer monomer and metal particles on the surface of the substrate provided with the first protrusions; subjecting the mixture corresponding to the second preset position to a curing treatment; forming a pattern of wire grid formed of the second protrusions with intervals on the surface of the base substrate; wherein each second protrusion covers at least one surface for polarization of one first protrusion.