A mechanical opener of bulk materials contains a vertical shaft mounted with possibility of rotation and blades connected with this shaft and perpendicular to its rotational axis, said blades are located at identical distance between adjacent blades. The number of vertical shafts mounted with possibility of rotation is increased to the paired number four at least and they are mounted on the horizontally placed frame in two parallel rows at the identical distance between adjacent blades, in this case, said shafts of one row are executed with possibility of rotation in one direction, and said shafts of another row are executed with possibility of rotation in opposite direction, furthermore, all shafts are executed with possibility of rotation at identical speed, and the blades are made in the form of cross-beams of identical length, centers of which are located on the longitudinal axes of shafts, and they are located on the shafts in such a manner that each blade is perpendicular to adjacent blade.