The invention discloses a chemical quantitative filling machine. The chemical quantitative filling machine comprises a body, a box body, a feeding port, a stirring plate, a controller, an electromagnetic valve and a gravity sensor; the box body is arranged on the upper side of the body, the feeding port is formed in the upper side of the box body, a motor is arranged on the right side of the box body, the stirring plate is arranged on the inner side of the box body, the controller is arranged on the lower side of the box body, and a processor is arranged on the inner side of the controller; the electromagnetic valve is arranged on the right side of the body, the electromagnetic valve is electrically connected to the processor, a base is arranged on the lower side of the body, the gravity sensor is arranged on the base, and the gravity sensor is electrically connected to the processor; and a connecting pipe is arranged between the box body and the electromagnetic valve. According to thechemical quantitative filling machine, the gravity sensor and the stirring plate are used, so that the accuracy of the filling injection amount is improved, the injection amount can be controlled, convenience is brought to people for use, the situation that the sediment phenomenon of a chemical liquid appears due to the fact that the chemical liquid is online in the box body for a long time is avoided, the liquid purity of the filled liquid is improved, and the effect of the chemical liquid is guaranteed.