Automatic hydraulic tensioning device

The utility model provides an automatic hydraulic tensioning device which comprises a tensioning device support, a hydraulic table body and a control box, a tensioning bearing seat is arranged in an inner cavity of the tensioning device support, and the tensioning bearing seat is connected with the inner cavity of the tensioning device support in a sliding mode. According to the chain tensioning device, the tensioning device support is arranged, internal elements are supported and protected, the safety and stability of the elements in the using process are improved, the tensioning degree of a chain is conveniently adjusted through cooperation of the tensioning bearing seat, the hydraulic cylinder body and the connecting nut, and the chain tensioning device is convenient to use. The chain tensioning device solves the problems that in material conveying equipment, chain tensioning is always difficult to solve, especially the problems that a dense medium is shallow in groove, the use environment is severe, manua