The utility model relates to a ready -package saline electrolysis groove, including electrode (1), electrolysis trough (2), the both ends welding of electrode (1) has flange (3) electrolysis trough (2) are provided with electrolyte entry (13) and electrolyte export (14), the welding is gone up in flange (3) has terminal (4), its characterized in that: flange (3) are discoid, electrolysis trough (2) are cylindric, the external diameter of discoid flange (3) is less than the internal diameter of electrolysis trough (2), radially fluted (5) of flange (3), there is O type circle (6) between the inner wall of recess (5) and electrolysis trough (2). There is the multiunit flange (3) radial recess (5), the number of O type circle (6) and the number phase -match of recess (5). The beneficial effects of the utility model are that: can realize batch production, good interchangeability. Simple installation, rapid, furthermore, the visual switch has good economical efficiency.