The finished size of this engineering mixer truck is 37.5 * 14 * 15.5cm, which is constructed from 959 granular building blocks. It realizes the height reduction of the appearance and function of the real mixer truck. The door can be opened, the head can be raised, the escalator, storage Jugs and other details are subtle. The engineering mixer has two modes of “individual travel” and “advance mixing”, which can be realized by switching the lever with one button. The mixer truck is equipped with a four-cylinder engine power configuration, front and rear power transmission systems, dual differentials, and wheel speed adjustment design. The mechanical transmission supports the three-dimensional display principle. Puzzles to promote parent-child relationship, not only toys but also a craft, decorating individual life.