A hoisting machinery, comprising: a steering wheel ; wheels; a pitman arm ; an active steering device , arranged between the steering wheel and the pitman arm , for adjusting a steering ratio of the steering wheel to the pitman arm according to a driving cycle of the hoisting machinery; a hydraulic power steering system; and a hydraulic power steering gear , arranged between the steering wheel and the pitman arm , for controlling the hydraulic power steering system to drive the steering of the wheels; wherein the active steering device comprises a differential gear train, the differential gear train comprises an input shaft to an output shaft , the active steering device is configured to adjust a transmission ratio of the input shaft to the output shaft so as to change a steering ratio of the steering wheel to the hydraulic power steering gear ; wherein the active steering device further comprises a motor, the differential gear train comprises a planet wheel , a tie bar , a first gear and a second gear , the motor is connected with the planet wheel in a driving manner through the tie bar , the first gear is engaged with the planet wheel , characterized in that the first gear is connected with the steering wheel through the input shaft , and the second gear is engaged with the planet wheel and is connected with the hydraulic power steering gear through the output shaft ; the active steering device is arranged between the hydraulic power steering gear and the pitman arm , the active steering device is configured to change a transmission ratio of an output of the hydraulic power steering gear to an output of the pitman arm . a steering wheel ; wheels; a pitman arm ; an active steering device , arranged between the steering wheel and the pitman arm , for adjusting a steering ratio of the steering wheel to the pitman arm according to a driving cycle of the hoisting machinery; a hydraulic power steering system; and a hydraulic power steering gear , arranged between the steering wheel and the pitman arm , for controlling the hydraulic power steering system to drive the steering of the wheels; wherein the active steering device comprises a differential gear train, the differential gear train comprises an input shaft to an output shaft , the active steering device is configured to adjust a transmission ratio of the input shaft to the output shaft so as to change a steering ratio of the steering wheel to the hydraulic power steering gear ; wherein the active steering device further comprises a motor, the differential gear train comprises a planet wheel , a tie bar , a first gear and a second gear , the motor is connected with the planet wheel in a driving manner through the tie bar , the first gear is engaged with the planet wheel , characterized in that the first gear is connected with the steering wheel through the input shaft , and the second gear is engaged with the planet wheel and is connected with the hydraulic power steering gear through the output shaft ; the active steering device is arranged between the hydraulic power steering gear and the pitman arm , the active steering device is configured to change a transmission ratio of an output of the hydraulic power steering gear to an output of the pitman arm . <EOS>