The utility model provides a hydraulic turning plough with an adjustable plough body space. The hydraulic turning plough comprises a plough frame, a plough body, a plough body fixing device, a hanging assembly and a hydraulic oil cylinder, wherein a guide through groove of the plough body fixing device is formed in a main beam, a first clamp plate and a second clamp plate of the plough body fixing device parallelly clamp the plough body for fixing the plough body, a first clamping arm and a second clamping arm are arranged on a surface, far away from the first clamp plate, of the second clamp plate, a first screw hole, a second screw hole and a third screw hole are formed in the first clamping arm, the first clamping arm and the second clamping arm of the second clamp plate are clamped on the main beam, in addition, the third screw holes formed in the first clamping arm and the second clamping arm are right aligned with the guide through groove of the plough body fixing device, and the plough body fixing device is fixed on the main beam through the first screw holes, the second screw holes and the third screw holes by adopting a screw rod and screw cap fixing mode.