Parallel polarization beam splitter with adjustable shearing difference

The invention relates to the field of polarized light technique application, and in particular to a parallel polarization beam splitter with an adjustable shearing difference. The parallel polarization beam splitter comprises two identical iceland spar right angle prisms, wherein light through surfaces of the prisms are right angle surfaces and inclined surfaces; an included angle of 16 degrees is formed between the two light through surfaces; prism optical axes are parallel to ridges cross the two light through surfaces; the light through surfaces of the two prisms are arranged in parallel; the distance between the light through surfaces can be adjusted. By adjusting the distance between the two prisms, the shearing difference of split parallel polarization beams can be adjusted, the shearing difference is in a linear direct proportion to the distance between the two prisms, the beam splitter can be used in positive and negative directions, and the shearing difference can be up to 14mm under the condition th