The main objective of the current research, 3-amino-1H‐1,2,4‐triazole immobilized on 3-chloropropyl joined SiO2 nanoparticles as a recyclable, environment-friendly, and novel heterogeneous base catalyst. It was characterized by fourier transform infrared, X-ray diffraction patterns, field emission scanning electron microscopes, and energy-dispersive X-ray spectroscopy. This new material as a green and efficient catalyst was used for the synthesis of pyrano [2,3-c]pyrazoles derivatives through the reaction of aromatic aldehydes, malononitrile, and 3-methyl-1-phenyl-2-pyrazoline-5-one. The reactions did in solvent-free conditions at 60°C and the related pyran derivatives prepared in excellent yields. Also, this catalyst could be used several times without decreasing the activity.