The invention discloses a method for continuously preparing tetraphenyl porphin. The method includes the following steps that 1, pyrrole and aromatic aldehyde are continuously added into a first reactor for conducting a reaction, and first reaction liquid is obtained; 2, the first reaction liquid obtained in step (1) and gas containing oxygen are continuously added into a second reactor for conducting a reaction, and second reaction liquid is obtained; 3, the second reaction liquid is cooled, crystallized, filtered and washed, and a tetraphenyl porphin product is obtained. The method has the advantages of being high in yield, high in reaction efficiency, low in energy consumption, safe, environmentally friendly and applicable to industrialization.