The utility model discloses a chassis car electrically -operated and manually operation blocking device detains the box and fixes on the door plant with the sleeve, and the baffle lies in to be detained between box and the door plant, and the baffle can rotate around the sleeve, ships and resell on another market and fixes on the left end highlights of baffle, and the lower part of baffle is half circular, and the electro -magnet lies in detains the box, and the electro -magnet passes through the mounting panel and fix in the left side of detaining the box, and it division has the arc groove to detain on the preceding face of box, and the centre of a circle of arc groove lies in the sleeve position, and the front end of shipping and reselling on another market passes the arc groove. The utility model has the characteristics of safe and reliable, simple structure, convenient operation, the interlocking is nimble.