The invention discloses a well lid opener which comprises a base. A pulley set, a well rope and a well lid fixing device are arranged on the upper portion of the base. The pulley set comprises a first pulley, a second pulley and a supporting rod. The first pulley comprises a first fixed component and a first rotating component. The second pulley comprises a second fixed component and a second rotating component. The first pulley and the second pulley are horizontally and fixedly connected through the supporting rod, and are vertically fixed to the upper portion of the base through the supporting rod. The supporting rod is fixedly connected with the first fixed component and the second fixed component. A handle is mounted on the outer edge of the second rotating component. One end of the well rope is fixedly mounted on the upper portion of the second fixed component, and the free end of the well rope strides over the upper portion of the first fixed component and is fixedly connected to the upper portion of the well lid fixing device. According to the opener, the well lid fixing device and a well lid are conveniently fixed, the well lid can be prevented from accidentally falling off when the well lid is opened and after the well lid is opened, and safety is good.