The invention discloses a wedge-shaped locking type fastener used for a circular steel pipe and a combined fastener. The fastener comprises two semicircular hoops which are hinged through a pin shaft and locked through a wedge block. The free end of the first semicircular hoop in the two semicircular hoops extends in the outer circle tangential direction to form a connection lug. An open groove is formed in the middle of the connection lug. The free end of the second semicircular hoop in the two semicircular hoops extends in the outer circle tangential direction to form a T-shaped clamping head. The free end of the first semicircular hoop is perpendicular to two tangent lines of the second semicircular hoop. The width of the vertical edge of the T-shaped clamping head is smaller than the width of the open groove of the connection lug. A long groove which is in slide fit with the vertical edge of the T-shaped clamping head is formed in the wedge block. The first semicircular hoop and the second semicircular hoop are wedged through the wedging face of the wedge block by means of the connection lug and the T-shaped clamping head. The combined fastener is formed by connecting two fasteners through a pivot in a rotatable mode. The wedge-shaped locking type fastener and the combined fastener have the advantages that the fastener is convenient to disassemble and assemble and reliable in locking, and the combined fastener can be used for connecting two circular pipes of any intersection angle.