Thread hooking structure of sewing machine

The thread hooking structure of the sewing machine comprises three curved needles and a needle frame assembly, the needle frame assembly comprises a needle frame body and a curved needle shaft, three first step faces in different inclination directions are arranged on the top face of the needle frame body, and the three first step faces correspond to the three curved needles respectively; one ends of the three curved needles are sequentially and detachably connected to the corresponding first step faces in the distribution direction of three needle holes in the inclined three-needle needle plate, the curved needle shaft penetrates through and is detachably connected to the bottom end of the needle frame body, the curved needle shaft rotates in a sewing machine body, and an avoiding groove used for avoiding a feed dog differential structure is formed in the needle frame body. Original three needle frames are arranged into the integrated needle frame body, the space occupied by the needle frame body can be save