The invention discloses a sweet potato seedling culture greenhouse having a water storage function. The sweet potato seedling culture greenhouse comprises a greenhouse body, a planting platform, a first greenhouse roof and thermostats, a cross beam is fixed at the top end inside the greenhouse body, one end of the top of the cross beam is hinged to the first greenhouse roof while the other end ofthe same is hinged to a second greenhouse roof, a solar cell panel is arranged at the top end of each of the second greenhouse roof and the first greenhouse roof, a temperature sensor is fixed at thebottom end of one side inside the greenhouse body, and a control panel is fixed at the bottom end of one side of the greenhouse body. By mounting the planting platform, planting grooves, a soil humidity sensor, water leaking holes, a water storage tank, a filter net, the control panel, a spraying device, a water diversion pipe, a water pump and nozzles, the soil humidity sensor senses soil moisture condition and transmits signals to a single chip microcomputer in the control panel, then the single chip microcomputer controls the nozzle to spray water, so that automatic water replenishing is facilitated when seedling culture soil lacks of water, artificial regular watering is not needed, and time and labor are saved.