Automatic siphon pollution discharge and purification system for unit culture

The utility model discloses an automatic siphon pollution discharge purification system for unit cultivation, which comprises a cultivation barrel, a water collecting barrel and an air exhaust collecting pipe, a communicating water pipe is connected between the cultivation barrel and the water collecting barrel, a drainage piece for collecting pollution and absorbing slag is arranged at the bottom of an inner cavity of the cultivation barrel, and a first drainage pipe is connected to the bottom of the cultivation barrel. A second drainage pipe is arranged at the water collecting bucket, one end of the air exhaust collecting pipe is communicated with the first drainage pipe and the second drainage pipe, and the other end of the air exhaust collecting pipe is connected with a vacuum generation assembly; the first drainage pipe and the second drainage pipe are both communicated with the confluence drainage main pipe, and the tail end of the confluence drainage main pipe is inserted into the drainage well and sea