The present invention relates to a device for adjusting the amount of water, the configuration of which has a plurality of unit unit body which is located in one side and the other, the unit unit body, the lower plate member having a flat shape, and both side surfaces of the lower plate member A pair of side plate members projecting upward from the pair, and coupled to the pair of side plate members, respectively, coupled to mutually opposing surfaces that are inner surfaces of the opposing side plate members, the center grooves being coupled grooves A pair of vertical guide members positioned vertically with respect to the lower plate member, the upper end of which is located above the side plate member, and the lower end of which is located on the lower end of the side plate member； Each of which is coupled to the pair of side plate members, and coupled to mutually opposing surfaces that are inner surfaces of the opposing side plate members, It has an engaging groove which is an excitation groove, and is positioned to form an inclined angle with respect to the lower plate member, the upper end of which is lower than the upper end of the vertical guide member, and the lower end thereof contacts the lower end of the vertical guide member. It has a pair of inclined guide member and a flat plate shape, both ends when in the first position is inserted into the engaging groove of the vertical guide member to be combined with the vertical guide member and in the second position Both ends include a blocking plate member inserted into the coupling groove of the inclined guide member to be coupled to the inclined guide member to adjust the amount of water that passes through the blocking plate member according to the coupling position of the blocking plate member. It is installed in the paddy field with a simple structure, and the amount of water provided to the paddy can be adjusted appropriately. Even if the amount of rain falls, the amount of water stored in the paddy ca
