The invention discloses a processing device and preparing method for environmentally friendly porous rock particle materials. The processing device comprises a crushing device and a flattening box, and a feeding port is fixedly connected to the center position of the upper end of the crushing device; a spherical crusher is arranged right below the feeding port; first vibrators are symmetrically arranged on the left side and the right side above the spherical crusher; and crushing blades are arranged on a rotating shaft, an arc-shaped sieve is arranged on the outer side of the spherical crusher, and a first conveying belt is arranged right below the crushing device. According to the processing device and preparing method for the environmentally friendly porous rock particle materials, a fastener is used for opening or closing the feeding port; and after materials enter the interior of the spherical crusher through the feeding port, the feeding port is closed by using the fastener, the rotating shaft is started to drive the crushing blades to crush the materials in the interior of the spherical crusher into materials with qualified sizes, and the materials with qualified sizes fall down through mesh holes of the arc-shaped sieve.