A grass mowing head (50) and a lawnmower (100) comprising said grass mowing head (50), the grass mowing head (50) comprising a housing assembly (51) and a spool (53)； the housing assembly (51) forms a housing cavity (511) and is provided with an external wire threading hole (544) allowing a mowing line (101) to penetrate deep inside the housing cavity (511) from the outside of the housing assembly (51), and the spool (53) is at least partially arranged inside the housing cavity (511) and is able to rotate about a central axis relative to the housing assembly (51)； and the spool (53) is provided with an inner wire threading hole (5351) through which the mowing line (101) penetrates or a wire clamping part for securing the mowing line (101). The present grass mowing head enables the user to be able to quickly and conveniently wind the line without disassembling the spool.
