The invention provides health-care and easy-worn knitted underpants for a man. The knitted underpants comprise separable pieces and connecting pieces of a
waist, knitted underpants body, a top fly and a
crotch, wherein the separable pieces and the connecting pieces are sewed and connected to form the knitted underpants; a U-shaped elastic fabric is added to the inner sides of the top fly and the
crotch; the fabric is that the outer edges of two sides are sewed to the edges of the top fly and the knitted underpants body, the outer edge of the upper side of the fabric is sewed to the joints of the knitted underpants body and the
waist, and the outer edge of the lower side is sewed to the
crotch, so as to form a space cavity among the U-shaped elastic fabric, the top fly and the crotch; an opening through which the male urogenital region passes while wearing is formed in the middle of the U-shaped elastic fabric; when in wearing, a user holds the middle part of the rear
waist of the knitted underpants and then pulls up to enable the
scrotum to be convenient to reach the space cavity for being fixed and positioned, and the
scrotum uneasily moves out and can be kept stable; in addition, the U-shaped elastic fabric is of a structure formed by interweaving
natural fiber yarns and spandex, so that the requirements on comfort, elasticity and none of releasing can be met.