Cultivated land soil irrigation device and steam mechanism and trigger mechanism thereof

The utility model relates to the technical field of irrigation devices, and discloses a cultivated land soil irrigation device and a steam mechanism and a trigger mechanism thereof, the irrigation device comprises the steam mechanism and the trigger mechanism, the top of the steam mechanism is fixedly connected with the trigger mechanism, the trigger mechanism is connected with a transmission line, and the transmission line is connected with the steam mechanism. The steam mechanism is placed on the land near the cultivated land, then clear water is injected into the water storage barrel through the water inlet pipe, meanwhile, the trigger mechanism is arranged at the top of the steam mechanism, and when outdoor sunlight is sufficient and the temperature is high, a heating pipe can heat water in the water storage barrel like a solar water heater; therefore, water vapor is generated and pressure is provided for the pressed part, the pressed part rises, the metal guide piece makes contact with the metal block at