The utility model discloses an automatic flower watering device, including the L casting box body, the L casting box body includes horizontal box and vertical enclosure, and just horizontal box is linked together with vertical enclosure's inside, interior bottom one side of vertical enclosure is equipped with the water pump, L casting box side face is equipped with the delivery port, the play water end (W. E. ) of water pump is connected with the water pipe, the side upper portion of the L casting box body is connected with the moisturizing pipe, install the solenoid valve in the pipe of moisturizing pipe, the top of the L casting box body is equipped with water inlet, control box and solar cell panel, and wherein, cargo position is between water inlet and solar cell panel in control, the inside of control box is equipped with the battery, is equipped with the controller in the control box, the fixation clamp is installed near one side of vertical enclosure in the bottom of horizontal box, the bottom of horizontal box is kept away from one side of vertical enclosure and is installed the gauge stick, humidity transducer is installed to the lower extreme of gauge stick. The utility model discloses novel structure, design benefit, it is rational in infrastructure, be fit for promoting.