The invention discloses a filtration treatment method of a water glass solution. The method comprises the following steps: (1) preparing a water glass concentrated solution; (2) carrying out buffer sedimentation treatment; (3) carrying out secondary filtration and sedimentation treatment; (4) storing. According to the water glass concentrated solution filtered and treated through the method provided by the invention, the transparency can be improved by around 50 percent, the quality of follow-up white carbon black manufacturing is improved, the problem that residues are easily remained in a concentrated alkaline storage tank and are inconvenient to clean is solved, and the method has great popularization and application values.