The invention relates to a height adjustment mechanism of a remote control lawn mower, which comprises a frame, a pivot rod, a link mechanism, a height adjustment rod, a height adjustment rod fixing mechanism, a power device and a rotary cutter； the mount includes The knife seat guard plate and the connecting rod, the knife seat guard plate can be moved up and down on the bottom side of the frame, the connecting rod suspends the knife seat guard plate on the bottom side of the frame； the height adjusting rod can drive the pivot rod to rotate, and the connecting rod mechanism The pivot rod rotates to move the knife holder up and down； the height adjustment rod is engaged with the height adjustment rod fixing mechanism to support the height of the holder support； the rotary cutter is disposed in the holder support and is driven by the power device； The user can adjust the mowing height by pulling the height adjustment rod, which is ergonomically easy to output, and can also shorten the time required for adjustment, and the low friction loss of the link mechanism makes the creation less laborious.本創作係遙控割草機的調高機構，其包含一車架、一樞桿、一連桿機構、一調高桿、一調高桿固定機構、一動力裝置及一旋刀；安裝座包含刀座護盤及連接桿，刀座護盤可上下移動地位於車架之底側，連接桿將刀座護盤懸掛於車架底側；調高桿可帶動樞桿轉動，連桿機構隨樞桿轉動而使刀座護盤上下移動；調高桿卡合於調高桿固定機構，以支撐刀座護盤高度；旋刀設於刀座護盤中，並受動力裝置驅動；藉此，使用者能以扳動調高桿的方式來調整割草高度，符合人體工學而容易出力，也能縮短調整所需的時間，同時連桿機構的低摩擦損耗使本創作較省力。
