A mowing machine head structure comprises an outer case, a drive assembly and a protection cover. The outer case being integrally formed comprises a cover body and a pivot part, in which the cover body has an accommodation space, and the pivot part located at a side edge of a middle section of the cover body has a connection channel connectively engaged with an operation rod. The drive assembly arranged in the accommodation space of the cover body is utilized to transmit power for rotating a tool. The protection cover configured on a bottom end of the cover body of the outer case is utilized to seal the drive assembly in the outer case. Accordingly, with the operation rod configured next to the gravity center of a mowing machine head based on an ergonomic design, the disclosed mowing machine head structure can be easily and conveniently operated by a user, thus to reduce the strength of an impact force caused by an external object or to prevent intrusion of foreign matters.本發明為一種割草機頭結構,包含一外殼、一驅動組件以及一保護蓋。該外殼為一體成形,具有一蓋體及一樞接部,該蓋體設有一容置空間,該樞接部位於該蓋體中段之側緣且設有一連接通道,該連接通道接設一操作桿;該驅動組件設置於該容置空間,用以傳輸動力而轉動一刀具;該保護蓋設於該蓋體之底端,用以將該驅動組件密封於該外殼內。此設計符合人體工學,操作桿鄰近該割草機頭重心,不僅讓使用者更加輕鬆、方便操作,還能降低外物撞擊力道或是避免異物進入。10‧‧‧割草機頭215‧‧‧頂端217‧‧‧側端219‧‧‧底端23‧‧‧樞接部232‧‧‧連接通道234‧‧‧外端口236‧‧‧內端口25‧‧‧環狀部27‧‧‧補強部272‧‧‧上片274‧‧‧下片29‧‧‧散熱部292‧‧‧散熱鰭片294‧‧‧通孔49‧‧‧心軸桿60‧‧‧保護蓋
