Anti-floating specimen bottle

The utility model relates to the field of medical instruments, in particular to an anti-floating specimen bottle which comprises a bottle body and a bottle cap movably connected with the bottle body, a screw is arranged at the center of the bottle cap, an umbrella-shaped containing portion is connected to the end of the screw, an umbrella frame is arranged on the end face of the inner side of the umbrella-shaped containing portion, the screw is sleeved with a sliding block in a sliding mode, and an umbrella rib is hinged to one end of the sliding block. The other ends of the umbrella ribs are hinged to the umbrella frame, the two sides of the sliding block are each provided with a guide rod, and a second elastic cover is detachably connected between the two umbrella ribs and the first elastic net cover. The umbrella-shaped containing part can reach a proper position in the bottle by rotating the screw rod, the sliding block moves on the screw rod by moving the guide rod up and down, the distance between the s