The utility model relates to an adopt large -scale dredge pump pump case of wear resistant cast iron inserts relates to a dredge pump pump case, specificly relates to the one kind large -scale wear -resisting welded fastening who inlays the combination inside lining of wear -resisting dredge pump pump case. An adopt large -scale dredge pump pump case of wear resistant cast iron inserts comprises pressure -bearing shell and wear -resisting inside lining, is provided with wear -resisting inside lining at the inner wall of pressure -bearing shell, wear -resisting inside lining includes filling layer, U type inlaying piece, annular inlaying piece, latch segment, branch stream block, chucking built -in fitting, welds the built -in fitting and seal the board. Being equipped with a plurality of cross sections in the inner wall subsides of pressure -bearing shell and for the U type inlaying piece of U -shaped, being provided with the filling layer between U type inlaying piece and the pressure -bearing shell, be provided with the cross section as required for the latch segment of U -shaped between U type inlaying piece, hugging closely U type inlaying piece in the exit of pressure -bearing shell, to be provided with the cross section be annular inlaying piece, is provided with the branch stream block who is used for shunting liquid near wear -resisting inside lining department between annular inlaying piece and U type inlaying piece.