A retaining plate applied to a sprinkler tripod is set onto a water manifold of the sprinkler tripod in a preset plate pattern, and located at an interior of the foot stands of the sprinkler tripod. Said retaining plate has a sleeving portion, arranged at a preset location of the retaining plate. With the sleeving portion, said retaining plate could be set on the water manifold to rotate by taking the water manifold as its axle center. Multiple abutting portions are formed onto periphery of the retaining plate. When the foot stands of the sprinkler tripod are in expanded state, the retaining plate is rotated such that the abutting portions are mated with the foot stands, and the foot stands can be abutted onto the abutting portions for secure support. Multiple openings are set at one side of the abutting portions of the retaining plate.
