The invention discloses a pseudo-thermal light source based on an array light beam. The pseudo-thermal light source comprises a pulse laser, a fiber coupler, an electro-optic phase modulator, a radio frequency driving power supply, a fiber amplifier, a fiber bundle array and a beam expansion collimator, wherein the pulse laser, the fiber coupler, the electro-optic phase modulator, the fiber amplifier and the fiber bundle array are successively connected through single-mode fibers, and the electro-optic phase modulator is driven by the radio frequency driving power supply; and laser emitted by the pulse laser, after being divided into multiple beams of coherent light by the fiber coupler, is transmitted to the electro-optic phase modulator for random phase modulation, then is transmitted to the fiber amplifier for power amplification, and then is output through the fiber bundle array and the beam expansion collimator. The pseudo-thermal light source provided by the invention can solve the problems of low output power and low intensity fluctuation rate existing in a conventional pseudo-thermal light source and realizes the effects of high brightness and rapid time-variation.