The invention discloses a hydroelectric power generation gate adjustable in water level. The hydroelectric power generation gate adjustable in water level structurally comprises a control machine body, a control hand wheel, a top beam, fixing supporting beams, a bottom beam, a water level adjusting spiral rod, a gate body, a lifting spiral pipe, a limiting block, an automatic water level adjustingpower generation device and a storage battery, wherein the control machine body is vertically arranged in the center of the upper portion of the top beam and connected with the upper surface of the top beam in an electric welding mode; the control hand wheel is arranged on the upper portion of the control machine body and movably connected with the control machine body; and the two fixing supporting beams are vertically arranged at the two side ends of the lower portion of the top beam. The hydroelectric power generation gate adjustable in water level has the beneficial effects that the automatic water level adjusting power generation device is arranged, the gate is controlled to automatically ascend and descend according to water pressure, the number of exposed stress rotary rollers is controlled according to the opening height of the gate, hydroelectric power generation is fully used, the automation performance of the hydroelectric power generation gate adjustable in water level iseffectively enhanced, and the hydroelectric power generation efficiency is improved.