Bottle cap and bottle facilitating drinking

The invention provides a bottle cap facilitating drinking. The bottle cap comprises an upper cover body and a lower cover body, wherein an inner cylindrical barrel and an outer cylindrical barrel arearranged in the lower cover body, the outer cylindrical barrel is detachably connected with a bottle opening of the bottle body, the upper cover body is arranged outside the upper end port of the lower cover body in a covered mode, an extending cylinder body penetrating through the inner cylindrical barrel is arranged in a cavity of the upper cover body, a sealing cover is arranged below the innercylinder barrel, the sealing cover sleeves the portion, below the lower cover body, of the extending barrel body, the top surface of the sealing cover is arranged at the position, except the extending barrel, of the top surface of the sealing cover and the end surface of the lower end of the inner cylindrical barrel, and the sealing cover is provided with a connecting piece which is detachably connected with the inner cyl