Fluid observation well mouth fixing device for earthquake monitoring

The utility model discloses a fluid observation well mouth fixing device for earthquake monitoring, and relates to the technical field of fluid measurement. The manhole cover comprises a manhole cover body, two through holes are sequentially formed in the upper end face of the manhole cover body, two first connecting rings are fixedly connected to the upper end face of the manhole cover body, two second connecting rings are fixedly connected to the lower end face of the manhole cover body, and the two first connecting rings and the two second connecting rings sequentially correspond to the two through holes in position. First positioning holes are sequentially formed in the upper end faces of the first connecting rings, and two threaded rods are arranged on the upper portion of the well lid. The split ring, the connecting plate, the connecting bolt, the fixing block, the second positioning hole and the first positioning hole are matched with one another to fix the threaded rod, so that the situation that the