The invention discloses a convenient device for preparing a new drug for treating senile dementia. The convenient device comprises a rack; the upper end face of the rack communicates with the externalspace to be provided with a feeding inlet; the lower end of the feeding inlet communicates with a crushing space; a net screening cavity is formed in the lower side of the crushing space; a ventilating hole is formed in the lower side of the left end wall of the net screening cavity; a stirring pelletizing cavity is formed in the right side of the net screening cavity; a horizontal hollow grooveis formed in the lower side of the left end face of the stirring pelletizing cavity; a shifting rod downwards extending is arranged in the hollow groove; a push plate is fixedly arranged on the rightend face of the shifting rod; a discharging outlet is formed in the lower side of the right end face of the stirring pelletizing cavity; and a discharging valve is fixedly arranged in the dischargingoutlet. During working of the convenient device, the convenient device is simple in structure and easy to operate, drug pelletizing is completed through the processes of feeding, crushing, screening,stirring and pelletizing, manpower is saved, dust pollution is reduced through the closed stirring pelletizing cavity, and the pelletizing working efficiency is improved through pelletizing plates andfiltering nets.