The invention discloses a slurry isolation device for ploughing. The device comprises a flexible shielding piece perpendicular to the horizontal plane, wherein mounting pieces are arranged at both ends of one side of the shielding piece, connecting components are arranged between the mounting pieces and the shielding piece, each connecting component comprises a telescopic piece, the telescopic axis of each telescopic piece is parallel to both the horizontal plane and the shielding piece, one end of each telescopic piece is connected with the shielding piece, the other end of each telescopic piece is connected with the corresponding mounting piece, and each mounting piece is connected with a handle of a cultivator. The shielding piece is arranged between the handles through the mounting pieces, and after arrangement is finished, the telescopic pieces are in a stretched state, so that the shielding piece between the handles is in a very straight state, and is prevented from a slack state, the condition that the middle part moves downwards under the action of gravity to splash slurry from a part above the shielding piece onto an operator is further avoided, and the comfort of the operator in use for ploughing is improved.