The invention provides automatic-descaling electrochemical water treatment equipment and an assembling method thereof. The equipment comprises a transversely arranged cylindrical shell, a cathode plate, an anode plate, a cathode pole and an anode pole, wherein at least one of the cylindrical shell can be opened and closed, the cathode plate, the anode plate, the cathode pole and the anode pole are arranged in the cylindrical shell, the cathode plate and the anode plate are adjacently arranged in a spaced manner, the cathode pole conductively penetrates through part or all of the cathode plate, and the anode pole is conductively penetrates through part or all of the anode plate.