Quantitative watering device for transplanter

The utility model relates to the technical field of seedling transplanting equipment, in particular to a quantitative watering device for a transplanter, which is characterized in that a first chamber and a second chamber are arranged in a pump body, a one-way valve is arranged in each chamber, and a piston reciprocates under the action of air pressure in the pump body, so that water absorption and water discharge processes are realized; namely, water enters the first chamber from the water inlet, then enters the second chamber through the communicating hole and flows out from the water outlet; water is watered through air pressure, the water flow speed is increased, water can flow out more quickly, the watering amount is stable, and therefore the advancing speed of the whole machine is guaranteed. The sliding assembly can control the one-time stroke of the piston, the water yield is controlled, and quantitative watering of the seedlings is achieved. The annular watering opening is formed in the water outlet,