The invention discloses a synthetic method of a 
covalent organic framework (COF) material. The method comprises the following steps: after mixing 1,3,5-benzenetricarboxaldehyde with 2,5-di(N,N-dimethyl)amino-1,4-benzdihydrazide uniformly in an 
organic solvent, reacting in the presence of a catalyst 
acetic acid to obtain the COF material, wherein the 
mole ratio of 1,3,5-benzenetricarboxaldehyde to 2,5-di(N,N-dimethyl)amino-1,4-benzdihydrazide is 1:(0.5-3). The COF material obtained by adopting the method has relatively large specific surface area and regular 
open framework structure with adjustable 
diameter, thus being beneficial for 
mass transfer of reactants and products in photoabsorption and catalytic processes; the material can serve as a photocatalyst and can increase the yield of the dehydrogenative 
coupling reaction between 2-phenyl-1,2,3,4-
tetrahydroisoquinoline and 
nitromethane from 39% in the absence of catalysts to 89%.