The object of the invention is to realize an apparatus for automatically and precisely filling single containers in succession with a pre-defined amount of products; each container is filled with two distinct loads of products, wherein the first load is determined according to its weight roughly measured, and the second load is determined numerically based on the difference between said first load and a pre-defined conventional weight; the apparatus comprises a first conveyor, a second conveyor loaded automatically with the products transported by the first conveyor, a third conveyor which is loaded with the agricultural products transported by the second conveyor and that transfers the products poured and present onto it inside a succession of single containers, weighing means able of weighing the total weight of the products on the whole present on the second conveyor, wherein the third conveyor is able of transferring the products poured and present on it in a succession of single containers; there is arranged a fourth conveying means preferably “V”-shaped and able of pouring a numerically controlled quantity of similar products onto the third conveying means, which, in the end, pours it onto a container below with a motion of going on and partial rotation.