A double bevel type double-knit circular knitting machine, comprising: a disk-shaped assembly comprising an inner annular needle cylinder holder and an outer annular needle cylinder holder extending around said inner annular needle cylinder holder, said inner annular needle cylinder holder and said outer annular needle cylinder holder sloping downward in two reversed directions at a same sloping angle with respect to a horizontal plane formed by said disk-shaped assembly to show a double bevel profile; a plurality of inner cam blocks each defining a respective needle track; a plurality of inner needles respectively arranged between said inner annular needle cylinder holder and said inner cam blocks and reciprocatable in the needle tracks of said inner cam blocks to perform a knitting process; a plurality of outer cam blocks each defining a respective needle track; a plurality of outer needles respectively arranged between said outer annular needle cylinder holder and said outer cam blocks and reciprocatable in the needle tracks of said outer cam blocks to perform a knitting process; an inner base member adjoined on an inner side of said inner annular needle cylinder holder; and an outer base member adjoined on an outer side of said outer annular needle cylinder holder, characterised by: a plurality of sector-shaped inner cam adjustment members fixedly mounted on a top side of said inner base member and abutted against one another along an inner surface of said inner annular needle cylinder holder, said inner cam blocks being respectively provided at a bottom side of each of said sector-shaped inner cam adjustment members; a plurality of sector-shaped outer cam adjustment members fixedly mounted on a top side of said outer base member and abutted against one another along an outer surface of said outer annular needle cylinder holder, said outer cam blocks being respectively provided at a bottom side of each of said sector-shaped outer cam adjustment members; and at least one sinker coupled to said outer needles or to said inner needles for holding down the knitted fabric during knitting of a single knit fabric, wherein the sloping angle of said inner annular needle cylinder holder and said outer annular needle cylinder holder is 50° to 60°. a disk-shaped assembly comprising an inner annular needle cylinder holder and an outer annular needle cylinder holder extending around said inner annular needle cylinder holder, said inner annular needle cylinder holder and said outer annular needle cylinder holder sloping downward in two reversed directions at a same sloping angle with respect to a horizontal plane formed by said disk-shaped assembly to show a double bevel profile; a plurality of inner cam blocks each defining a respective needle track; a plurality of inner needles respectively arranged between said inner annular needle cylinder holder and said inner cam blocks and reciprocatable in the needle tracks of said inner cam blocks to perform a knitting process; a plurality of outer cam blocks each defining a respective needle track; a plurality of outer needles respectively arranged between said outer annular needle cylinder holder and said outer cam blocks and reciprocatable in the needle tracks of said outer cam blocks to perform a knitting process; an inner base member adjoined on an inner side of said inner annular needle cylinder holder; and an outer base member adjoined on an outer side of said outer annular needle cylinder holder, characterised by: a plurality of sector-shaped inner cam adjustment members fixedly mounted on a top side of said inner base member and abutted against one another along an inner surface of said inner annular needle cylinder holder, said inner cam blocks being respectively provided at a bottom side of each of said sector-shaped inner cam adjustment members; a plurality of sector-shaped outer cam adjustment members fixedly mounted on a top side of said outer base member and abutted against one another along an outer surface of said outer annular needle cylinder holder, said outer cam blocks being respectively provided at a bottom side of each of said sector-shaped outer cam adjustment members; and at least one sinker coupled to said outer needles or to said inner needles for holding down the knitted fabric during knitting of a single knit fabric, wherein the sloping angle of said inner annular needle cylinder holder and said outer annular needle cylinder holder is 50° to 60°. a plurality of sector-shaped inner cam adjustment members fixedly mounted on a top side of said inner base member and abutted against one another along an inner surface of said inner annular needle cylinder holder, said inner cam blocks being respectively provided at a bottom side of each of said sector-shaped inner cam adjustment members; a plurality of sector-shaped outer cam adjustment members fixedly mounted on a top side of said outer base member and abutted against one another along an outer surface of said outer annular needle cylinder holder, said outer cam blocks being respectively provided at a bottom side of each of said sector-shaped outer cam adjustment members; and at least one sinker coupled to said outer needles or to said inner needles for holding down the knitted fabric during knitting of a single knit fabric, wherein the sloping angle of said inner annular needle cylinder holder and said outer annular needle cylinder holder is 50° to 60°.