Drainage bottle convenient for specimen collection and drainage structure thereof

The utility model discloses a drainage bottle and a drainage structure convenient for specimen collection, which comprise a sleeve, a support rod is sleeved in the sleeve, and the top of the sleeve is bolted with a limit sleeve; by pulling the supporting rod, the supporting rod moves in the casing pipe, then the limiting bolt is screwed, the limiting bolt limits and fixes the supporting rod through cooperation of the limiting sleeve, and therefore the height of the device can be effectively adjusted; one end of a fourth connecting pipe is communicated with a drainage pipe, then a negative pressure pump is started, the negative pressure pump exhausts air in a bottle body, negative pressure is formed in the bottle body, then the bottle body enables negative pressure to be formed in a connecting bottle through a second connecting pipe, effusion in the body of a patient is pumped out, and then the effusion flows into the bottle body through a three-way valve. And then the three-way valve can be operated, so that