The utility model discloses a stainless steel cask, including the staving, staving upper portion is equipped with water inlet and gap, the staving lower part is equipped with delivery port and discharge opening, be equipped with a plurality of installations piece around the delivery port periphery, all be equipped with the mounting groove that the opening direction is the same in the installation piece, the periphery of filter screen be equipped with and install the interblock the space cooperation and with installation slot gap complex auxiliary block, the dipping barrel comprises a barrel body, the mounting groove opening part is equipped with the locking groove with the mounting groove intercommunication, the locking piece at the locking inslot is established in the slip, it makes the locking piece support the reset spring at mounting groove side channel wall to be equipped with between the tank bottom in locking piece and locking groove, corresponding locking piece was equipped with and is used for the spacing joint spare of locking piece on the locking piece passed and installs the piece and install the piece outer wall, the locking piece has the simple and convenient advantage of dismouting of the filter screen of stainless steel cask delivery port department inside the locking piece leaves the mounting groove when spacing by joint spare.