The invention relates to a Y shaping and trimming method of plums. The Y shaping and trimming method comprises the steps of production of plum seedlings, shaping frame building, fixed planting in a shaping frame, summer trimming, winter trimming and shaping frame removal. According to the Y shaping and trimming method of the plums, the tree shapes are specified and uniform through the shaping frame garden building, a frame of a tree is firm, the ventilation and the light transmission are good, the management is convenient, the result distribution is uniform, the unit area yield is high, the Y shaping and trimming method is suitable for mechanized operation, and the application prospect is wide.