In summary, we investigated the magnetic properties of 24 triangulene dimers by using first-principles calculations. Our results show that these dimers possess tunable magnetic interactions, spanning from -0.05 meV to -128 meV, with several dimers surpassing the Landauer limit at room temperature, such as TOT-TOT, TAM-TAM, TOT-CC-TOT, and PLY-PLY. Among them, TAM-TAM has the strongest J of -128 meV, making it a promising candidate for practical applications in organic spintronics.