The utility model relates to a blade structure of a lawn mower.Including a piece,It has a middle part.And a mounting hole is arranged in the middle part；The middle part is connected with at least two wings.Each wing part is connected to the middle part by a connecting side.And the middle part is the center and extends outwards；Each wing has a first side and a second side respectively on both sides of its extending direction.The first side is a blade.The first side is provided with a hollow part which is recessed towards the second side direction.Or the second side is provided with a hollow part which is concave in the direction of the first side.Or the first side and the second side are respectively provided with a hollow part which is concave toward each other.With this structure, the whole weight is reduced and the vibration amplitude is reduced.一種割草機之刀片結構，包括有一片體，其具有一中間部，且於中間部設有一安裝孔；此中間部連接至少二翼部，各翼部分別以一連接側連接於中間部，且以中間部為中心朝外伸出；各翼部於其伸出方向之兩旁分別具有一第一旁側及一第二旁側，其中第一旁側為一刀鋒，而第一旁側設有一朝第二旁側方向凹入之鏤空部，或第二旁側設有一朝第一旁側方向凹入之鏤空部，或第一旁側及第二旁側分別設有一朝彼此方向凹入之鏤空部。本創作藉此結構降低整體重量，進而減輕使用時的震動幅度。
