The invention discloses a power control device of a field manage machine. The power control device comprises a supporting seat with a handlebar, and a traveling box and a ridging box which are in transmission connection with an engine gearbox are arranged on the supporting seat; the traveling box is in transmission connection with a travelling wheel through a transmission shaft; the ridging box is in transmission connection with a ridging plough through a transmission shaft; a speed gear lever and a forward and withdraw gear lever which are arranged on the travelling box as well as a ridging gear lever arranged on the ridging box are movably and respectively connected with a speed connecting lever, a forward and withdraw connecting lever and a ridging connecting lever; a clutch control unit in transmission connection with the gearbox is arranged on the handlebar; a speed control unit movably connected with the speed connecting lever and a forward and withdraw control unit movably connected with the forward and withdraw connecting lever are arranged on the travelling box; a ridging control unit movably connected with the ridging connecting lever is arranged on the ridging box; a steering unit is arranged at the joint of the handlebar and the supporting seat. By the arrangement, travelling distance is obviously shortened, and the problem that other components are easily touched due to long travelling distance is effectively solved.