The utility model belongs to the technical field of the lawn mower accessory is used, specifically disclose a be applied to lawn mower grass cutting blade's blade holder, including the blade holder body, and set up the circular spacing recess on the blade holder body, and the symmetrical two sets of locating ear boards that set up on circular spacing recess, and set up the first locating hole at the locating ear inboard respectively, and the spacing collar of setting in the middle of circular spacing recess. The utility model discloses a beneficial effect who is applied to lawn mower grass cutting blade lies in: equitable and the uses that match such as locating ear board, first locating hole and spacing collar of its integrated into one piece structural design, its long service life, and need not often to examine and repair the availability factor height, first stopper, second stopper, first spacing groove and second spacing groove isotructure has solved the inconvenient installation of current lawn mower blade holder, has maintained and unstable, accurate, the easy not hard up problem in location that application scope is wide, assemble safe in utilizationly, has improved assembly and maintenance efficiency simultaneously, and the cleanness maintenance of being convenient for.