A water outlet assembly of a stool washing device comprises a water outlet head installed with a main portion and a sub-portion; an upper end of the water outlet head having a main inlet and a sub-inlet; the main inlet being communicated to the output hole of the main portion and the sub-inlet being communicated to the outlets of the sub-portion; an adjust portion having two insertion ends at a lower end thereof; each insertion end having a ball like shape; a lower end of each insertion end having a through hole; the insertion ends being engaged to the main inlet and the sub-inlet with the through holes being communicated to the main inlet and the sub-inlet; wherein rotation of the adjust portion will adjust the water output from the outlets.