Seat adjusting structure, adjusting method and engineering machinery seat

The invention discloses a seat adjusting structure, adjusting method and an engineering machinery seat. The seat adjusting structure comprises a seat body, a damping force unit is installed at the upper end of the seat body, a cab connecting plate is installed at the lower end of the seat body, and an electronic controller and a seat weight sensor are installed between the damping force unit and the cab connecting plate; a rigidity unit and an operator existence indicator are installed on the lower portion of the damping force unit; a seat shock absorber is installed above the cab connecting plate; the operator existence indicator is used for detecting whether an operator exists or not; the seat weight sensor is used for detecting whether the weight of the operator is within a set range or not; the electronic controller is used for receiving detection signals of the operator existence indicator and the seat weight sensor and controlling the damping force unit and the rigidity unit to adjust the rigidity and t