The invention relates to a polarization state non-uniform distribution beam generating method and a device thereof, aiming at the complex structure and big realization difficulty of the prior art by adopting a sub-wavelength grating structure to fulfill a polarization state non-uniform distribution beam. The invention is composed of a light source arranged on the symmetry axis of the same system,as well as an external reflection type conical surface reflector, a conical surface polarizer, an internal reflection type conical surface reflector, which are sequentially arranged on the exit beam light path of the light source. The exit beam forms a conical surface transmission beam with radial transmission component and axial transmission component after being reflected by the external reflection type conical surface reflector and forms a polarization state non-uniform distribution beam through the reflection by the internal reflection type conical surface reflector after the beam polarization state is changed by the conical surface polarizer. The generating method is characterized by simple steps, convenient realization, wide application and the like and the device is characterized byreasonable structure design, few parts, convenient use, and the like.