Device for damping the stresses of agricultural vehicles, comprising: - at least one feeding line of a pressurized work fluid; - at least one lifting apparatus for lifting at least one work tool, provided with at least one actuation element and with at least one thrust chamber communicating with said feeding line and adapted to move said actuation element due to the effect of the variation in pressure of the work fluid inside it; - at least one drain line of the work fluid; - valve means (9, 17) interposed between said feeding line and said drain line and configured to place them in communication with each other as a result of a predefined pressure increase inside said thrust chamber, wherein said valve means (9, 17) comprise first valve means interposed between said feeding line and said drain line and adapted to place them in communication with each other when achieving said predefined pressure increase, at least one piloting line acting on said first valve means and second valve means which can be commanded in order to place in communication/isolate said piloting line with/from said feeding line, characterized by the fact that said first valve means comprise at least one body in which at least one seat is formed, provided with at least a first port communicating with said feeding line, with at least a second port communicating with said piloting line and with at least a third port communicating with said drain line, where inside said seat is housed at least one shutter placed facing said first port and moveable between a closing position and an opening position of the first port itself, where in the opening position said first port is placed in communication with said third port, and at least one piloting element is placed facing said second port and adapted to push said shutter towards the closing position, said shutter displacing to the opening position as a result of said predefined pressure increase and of the isolation of said piloting line from said feeding line. - at least one feeding line of a pressurized work fluid; - at least one lifting apparatus for lifting at least one work tool, provided with at least one actuation element and with at least one thrust chamber communicating with said feeding line and adapted to move said actuation element due to the effect of the variation in pressure of the work fluid inside it; - at least one drain line of the work fluid; - valve means (9, 17) interposed between said feeding line and said drain line and configured to place them in communication with each other as a result of a predefined pressure increase inside said thrust chamber, wherein said valve means (9, 17) comprise first valve means interposed between said feeding line and said drain line and adapted to place them in communication with each other when achieving said predefined pressure increase, at least one piloting line acting on said first valve means and second valve means which can be commanded in order to place in communication/isolate said piloting line with/from said feeding line, characterized by the fact that said first valve means comprise at least one body in which at least one seat is formed, provided with at least a first port communicating with said feeding line, with at least a second port communicating with said piloting line and with at least a third port communicating with said drain line, where inside said seat is housed at least one shutter placed facing said first port and moveable between a closing position and an opening position of the first port itself, where in the opening position said first port is placed in communication with said third port, and at least one piloting element is placed facing said second port and adapted to push said shutter towards the closing position, said shutter displacing to the opening position as a result of said predefined pressure increase and of the isolation of said piloting line from said feeding line.