Hydraulic amplitude modulating device for ploughshare-postposed single plough body

The utility model provides a hydraulic amplitude modulating device for a ploughshare-postposed single plough body. The hydraulic amplitude modulating device comprises an amplitude modulating frame, wherein a hydraulic motor is arranged on the outer side of the amplitude modulating frame; a rotating shaft of the hydraulic motor is fixedly connected with a bearing; the bearing is fixedly connected with a screw rod; two oppositely parallel guide rods are arranged inside the amplitude modulating frame; guiding sleeves are sleeved with the guide rods respectively; an amplitude modulating beam is fixed between the two guiding sleeves; a nut is welded on the amplitude modulating beam; the screw rod penetrates through the amplitude modulating beam and penetrates through the nut; the amplitude modulating beam is driven to move up and down along with the left-and-right rotation of the screw rod. According to the hydraulic amplitude modulating device provided by the utility model, the hydraulic motor drives the screw ro