Triazine-based covalent-organic frameworks (TriCF) has been prepared successfully through a facile solvothermal reaction and applied to evaluate the tribological performances as lubricant additive. TriCF exhibited the lamellar structure feature and high thermo-stability, and pictured the excellent dispersity in poly-alpha-olefin- 10 oil. The tribological tests demonstrated that adding 0.6 wt% TriCF into PAO-10 oil can great reduce coefficient of friction and volume of wear for steel-steel system, while 0.2 wt% TriCF was perfectly competent for steel-copper system. The analysis of worn surface revealed that the lamellar structure was crux to ensure the TriCF easy slide during the sliding process, reducing the coefficient of friction. The strong affinity from matrix can avoid the cracking-off of protective film, supporting the running stability.