The invention discloses a modular kitchen garbage disposal device which comprises a shell, a crushing mechanism, a stirring barrel and an air feeding mechanism. The crushing mechanism, the stirring barrel and the air feeding mechanism are installed in the shell. The shell is provided with an inlet and an air outlet with the corresponding height. The crushing mechanism is used for undertaking materials of the inlet and provided with multiple sets of crushing roller wheels. The working gap among the multiple sets of crushing roller wheels is sequentially reduced in the material advancing direction. The stirring barrel is used for undertaking materials crushed by the multiple sets of crushing roller wheels. A stirring shaft and multiple sets of stirring blades installed on the stirring shaftare arranged in the stirring barrel. The circumferential face of the stirring barrel is provided with a discharge outlet. The discharge outlet and the outlet are connected through a conveying pipelineprovided with a spiral propeller. Kitchen garbage can be crushed to be relatively uniform mixture through the crushing mechanism, secondary utilization of garbage organic matter can be achieved afterthe garbage is stirred and fermented through the multiple sets of stirring blades in the stirring barrel, and the disposal efficiency and utilization effect of kitchen garbage are improved.