The embodiment of the invention provides a wire grid polarizer, a manufacturing method of the wire grid polarizer and a display device, and relates to the field of display technologies. According to the manufacturing method of the wire grid polarizer, the problem that a wire grid polarizer is high in production cost in the manufacturing process is solved. The manufacturing method of the wire grid polarizer includes the steps that the surface of a base plate of a substrate is coated with a first polymer monomer; curing process is carried out on the first polymer monomer corresponding to a preset position; patterns of first protrusions arranged at intervals are formed on the surface of the base plate of the substrate; the surface, where the first protrusions are formed, of the base plate is coated with mixtures of a second polymer monomer and metal particles; curing process is carried out on the mixtures corresponding to the preset position; wire grid patterns composed of second protrusions arranged at intervals are formed on the surface of the base plate of the substrate; at least one polarizing surface of each first protrusion is covered with the corresponding second protrusion.