Dye removal from industrial wastewater is a long-standing challenge, due to the environmental concerns and created health risks. To address this issue, various adsorbents have been synthesized and used to remove different dyes from water. In this work, a magnetic triazine covalent organic framework (MTCOF) has been synthesized and investigated to remove Janus Green (JG) and Malachite Green (MG) cationic dyes from water. Different parameters including pH, time, amount of adsorbent, and volume of the sample on dye removal efficiency and the mechanism of due adsorption were investigated. The maximum adsorption capacity of MTCOF to remove JG and MG was 248 mg g−1 and 336 mg g−1 respectively. Adsorption kinetics and isotherms for both dyes followed the pseudo-quadratic and Langmuir models, respectively. In the optimum conditions 97–100 % removal efficiencies for both JG and MG were achieved for 4 cycles.