An electrobath capable of being used for continuous electrolysis to synthesize butanedioic acid comprises a box body, a cathode and an anode. The box body is provided with an electrolyte inlet and anelectrolyte outlet and connected with a gas collector. The bottom of the box body is connected with an electrode paste collector which comprises a paste collecting chamber. An outlet of the paste collecting chamber is connected with an electrode paste storage chamber on which a valve is arranged. The electrobath has the advantages that the electrode paste discharge does not require power interruption nor influence the flowing state of the electrolyte and the continuous electrolysis production of the butanedioic acid is completely not influenced.