The invention discloses a water supply device for landscaping. The water supply device for the landscaping comprises a water storage tank, a pipeline, a water pump, a connecting pipe and a supportingbuffer mechanism, wherein the water pump is located on one side of the water storage tank, the water pump is connected with the water storage tank through the connecting pipe, a water outlet of the water pump is connected with the pipeline, the supporting buffer mechanism comprises a first supporting seat, a second supporting seat, a supporting table, a rubber pad, a first supporting opening, a second supporting opening, an abutting block, a movable block, a spring seat and a groove, wherein the second supporting seat is fixed to the top of the supporting table, the second supporting opening is formed in the top of the second supporting seat, the groove is formed in the second supporting seat, and one end of the movable block is embedded into the groove. The water supply device for the landscaping has the beneficial effects that through the designed supporting buffer mechanism, the buffer of the pipeline is further increased while the pipeline is supported, and through a designed guidemechanism, the guide during fixing of a second flange plate and a first flange plate is increased, so that the second flange plate and the first flange plate are fixed more quickly.