The invention relates to the technical field of water spray in gardens, and in particular relates to a working method of a water spraying device for plants used in a garden. When the plants in the garden need to be irrigated, the whole device is firstly mounted on a traction device, when the whole device moves to the position of the plants to be irrigated, a plurality of driven components are driven by a driving component to rotate, the driven components are in transmission connection with spray bearing components, so that the spray bearing components are driven to move on positioning supporting plates; and when the spray bearing components move to the position of the plants to be irrigated, the spray bearing components start to spray water to the plants to be irrigated. The method disclosed by the invention can realize pertinence of spraying the water to the plants, save irrigation water, improve a water utilization rate, and reduce output of manpower and material resources.