Vacuum multi-beam laser transceiving parallelism testing device

A vacuum multi-beam laser transmitting and receiving parallelism testing device uses different-side transverse migration angle mirrors to translate laser beams emitted by laser transmitters and keep the propagation direction unchanged, and the different-side transverse migration angle mirrors are installed at light outlets of the transmitters, so that all multi-beam transmitters and receiving systems share a small caliber, and the aperture is smaller than the aperture. The receiving and transmitting parallelism test of the laser radar can be realized through the small-caliber vacuum tank window and the parallel light pipe, the problem that the requirement of the current multi-beam laser radar on the caliber of test equipment is high is solved, and the economic benefit is high. The transmitting-receiving parallelism testing device comprises an attenuation device, a different-side transverse migration angle mirror, a collimator, double pentaprisms, a laser beam analyzer, an optical fiber light source and a data