The invention discloses a control method for a combination metering device. The control method includes the following steps that the single target weight of products is manually input; the combination metering device runs; the average weight Mi of the single products of the ith combination is automatically calculated and stored through the combination metering device; N times of weighing are conducted through the combination metering device, and the total weight L of the single products is automatically calculated; whether N is equal to the set number of combination times or not is judged; if N is not equal to the set number of the combination times, the combination metering device returns the running state; if N is equal to the set number of the combination times, the average weight J of the single products in N times of weighing is calculated; and the obtained J is used for correcting the average weight of the single products, manual input of the single target weight of the products is replaced, the combination metering device is input again, and the combination metering device runs again. By means of the control method, an electronic scale does not need to be additionally arranged, the labor amount of manual operation is also reduced, and the cost is reduced.