A power-assisted steering mechanism for an electric pallet truck, comprising: an operating mechanism; a power assistor assembly; a driving mechanism; and a mounting bracket; wherein the operating mechanism comprises a handle and a handle seat, a lower end of the handle is connected to an upper end of the handle seat; the power assistor assembly comprises a power assist mechanism and a controller, and the power assist mechanism is electrically connected to the controller; an upper end of the power assist mechanism is provided with an input shaft, and a lower end of the power assist mechanism is provided with an output shaft, and an upper end of the input shaft arranged at the upper end of the power assist mechanism is rigidly and drivably connected to a lower end of the handle seat; the mounting bracket comprises a mounting plate and a mounting seat, the mounting plate is fixed to an upper end of the mounting seat, the mounting seat is configured to be fixedly connected to a vehicle body, and an outer casing of the power assist mechanism of the power assistor assembly is fixedly connected to the mounting plate; the driving mechanism comprises a drive connecting shaft, a reduction gearbox, a driving wheel and a driving motor; the drive connecting shaft is rotatably connected to the mounting seat, an upper end of the drive connecting shaft is rigidly and drivably connected to a lower end of the output shaft of the power assist mechanism, and a lower end of the drive connecting shaft is fixedly connected to an upper end of a housing of the reduction gear box; a housing of the driving motor is fixedly connected to the housing of the reduction gearbox; an output shaft of the driving motor is drivably connected to an input shaft of the reduction gearbox, and an output shaft of the reduction gearbox is drivably connected to the driving wheel to further drive the driving wheel to rotate; characterized in that the drive connecting shaft is rotatably connected to the mounting seat by an upper deep groove ball bearing, a lower deep groove ball bearing and a thrust ball bearing; and wherein the upper deep groove ball bearing is positioned above the lower deep groove ball bearing, the thrust ball bearing is located below the lower deep groove ball bearing, and the thrust ball bearing and the lower deep groove ball bearing are separated by a washer. an operating mechanism; a power assistor assembly; a driving mechanism; and a mounting bracket; wherein the operating mechanism comprises a handle and a handle seat, a lower end of the handle is connected to an upper end of the handle seat; the power assistor assembly comprises a power assist mechanism and a controller, and the power assist mechanism is electrically connected to the controller; an upper end of the power assist mechanism is provided with an input shaft, and a lower end of the power assist mechanism is provided with an output shaft, and an upper end of the input shaft arranged at the upper end of the power assist mechanism is rigidly and drivably connected to a lower end of the handle seat; the mounting bracket comprises a mounting plate and a mounting seat, the mounting plate is fixed to an upper end of the mounting seat, the mounting seat is configured to be fixedly connected to a vehicle body, and an outer casing of the power assist mechanism of the power assistor assembly is fixedly connected to the mounting plate; the driving mechanism comprises a drive connecting shaft, a reduction gearbox, a driving wheel and a driving motor; the drive connecting shaft is rotatably connected to the mounting seat, an upper end of the drive connecting shaft is rigidly and drivably connected to a lower end of the output shaft of the power assist mechanism, and a lower end of the drive connecting shaft is fixedly connected to an upper end of a housing of the reduction gear box; a housing of the driving motor is fixedly connected to the housing of the reduction gearbox; an output shaft of the driving motor is drivably connected to an input shaft of the reduction gearbox, and an output shaft of the reduction gearbox is drivably connected to the driving wheel to further drive the driving wheel to rotate; characterized in that the drive connecting shaft is rotatably connected to the mounting seat by an upper deep groove ball bearing, a lower deep groove ball bearing and a thrust ball bearing; and wherein the upper deep groove ball bearing is positioned above the lower deep groove ball bearing, the thrust ball bearing is located below the lower deep groove ball bearing, and the thrust ball bearing and the lower deep groove ball bearing are separated by a washer.