The invention discloses a writing brush practicing device, which comprises a practicing box and a supporting frame, wherein the supporting frame is detachably connected with the practicing box, the supporting frame is used for supporting the practicing box, the practicing box comprises a top cover, a box body and a bottom cover, the top cover is rotatably connected with the top of the box body, the bottom cover is rotatably connected with the bottom of the box body, the top cover comprises a cover body and a writing platform, the writing platform is installed at the top of the cover body, thecover body is provided with a copying clamp, the copying clamp is used for clamping paper, the cover body is provided with a first containing groove, the first containing groove is used for containingthe copying clamp, the box body comprises a body, a box core and an inkstone, the body is provided with a second containing groove and a third containing groove, the box core is mounted at the bottomof the body, the inkstone is slidably connected with the body and accommodated in the second containing groove, and the third containing groove is used for accommodating paper. The writing brush practicing device is convenient to store, calligraphy can be practiced anytime and anywhere, and the portability of the writing brush practicing device is improved.