Automatic door opening positioning mechanism

The invention discloses an automatic door opening positioning mechanism, and belongs to the field of hinges or pivots of doors, windows or sashes. Aiming at the problems that in the prior art, doors need to be manually pushed, cover caps needs to be pressed, and the locking angle is singular, the following scheme is provided, specifically, after a door entrance induction corrugated pipe senses external pressure, water in the door entrance induction corrugated pipe is squeezed, the squeezed water gradually flows into a door opening corrugated pipe, the door opening corrugated pipe expands to push a door, and thus, the door is opened; the lower portion of the door opening corrugated pipe communicates with a water inlet pipe, and the water in the door opening corrugated pipe is slowly pouredinto a sealed water box; when a door closing induction corrugated pipe senses external pressure, air in the door closing induction corrugated pipe is compressed to enter the sealed water box, the high-pressure airflow in the sealed water box constricts waterflow to go upwards along a water outlet pipe stretching into the lower portion of the liquid level, the waterflow is injected into a door closing corrugated pipe, and accordingly, the door is pushed to be closed; and the door closing corrugated pipe internally communicates with a circulation water pipe, and the waterflow in the door closingcorrugated pipe is slowly poured into a door entrance S-shaped pipe through the circulation water pipe.