The invention discloses a garden seedling device capable of supplying water with adjustable speed. The device comprises a shell, a water suction device and a water supply pipe, wherein the inner sideof the bottom of the shell is provided with a soil layer, the outer side of the right side of the shell is provided with a PLC controller, the PLC controller is provided with a control panel, the water suction device is provided with a piston tube, a piston is inserted in the piston tube, the left side of the piston is fixedly provided with a first pull rod, the left side of the first pull rod isconnected to a second pull rod, the left side of the second pull rod is connected to a fixing column through a sleeve, a rotatory table is fixedly arranged on an output shaft of a servo motor, the water supply pipe is inserted into the soil layer, the water supply pipe is provided with longitudinal water supply pipes arranged in an array, the outsides of the water supply pipe and longitudinal water supply pipes are all sleeved with spongy tubes. The garden seedling device capable of supplying water with the adjustable speed has the advantages that the water supplement is uniform, the water supplement quality is high, the device is beneficial to seedling, a humidity sensor senses the humidness of the soil layer, the rotation speed of the servo motor is adjusted, a soil environment with suitable humidness is provided for seedling, and the seedling survival rate is high.