The invention discloses a low-cut-off frequency hybrid spatial filter. The low-cut-off frequency hybrid spatial filter comprises a volume Bragg grating, a first focusing lens, a pin hole and a second focusing lens which are arranged in sequence, wherein the volume Bragg grating performs Bragg diffraction on incident light, the first focusing lens performs Fourier transform on the light diffracted by the volume Bragg grating and transforms a light beam from a spatial domain to a frequency domain, second spatial filtering of the light beam is achieved through the pin hole, and the second focusing lens transforms the light beam from the frequency domain to the spatial domain so as to finish spatial filtering. The low-cut-off frequency hybrid spatial filter is completely different from a traditional spatial filter only provided with a lens and a pin hole, and the possibility that focused laser causes the hole stopping effect and enables filtering components and parts to be burned down is reduced. The low-cut-off frequency hybrid spatial filter has low cut-off frequency and low-frequency loss efficiency, has excellent lowpass filtering capacity and is high in bearable laser power.