The invention discloses a seat and agricultural machinery with the same. The seat comprises a seat main body and a positioning adjusting device, wherein the position adjusting device comprises a supporting base, a horizontal sliding rack and a vertical sliding rack, wherein the horizontal sliding rack is slidably connected with the base and slides along the horizontal direction; the vertical sliding rack is slidably connected with the horizontal sliding rack and slides along the vertical direction; the vertical sliding rack is connected with the seat main body; and an elastic supporting mechanism is also arranged between the vertical sliding rack and the base. The position adjusting range of the seat can be expanded by using the position adjusting device which can adjust the position of the seat in the horizontal direction and the vertical direction, so that using demands of drivers with different heights and different driving habits can be met; the seat is not required to be manually dragged in a position adjusting process by using the elastic supporting mechanism; the seat can be automatically adjusted; and moreover, the elastic supporting mechanism has an elastic buffering performance, so that the seat has a damping function, and the driving comfort level is improved.