The invention relates to an SNS (Social Networking Service) flexible network knot tying machine comprising a shell, wherein a positioning mechanism is arranged on the shell; the positioning mechanism comprises a fixed first positioning rod and a translational second positioning rod, wherein circular grooves for placing steel wires are both arranged on the root part of the first positioning rod and on the second positioning rod; a bending mechanism is arranged at the bottom of the shell; the bending mechanism comprises a first connecting rod and a second connecting rod which are articulated together, wherein the first connecting rod is connected with a third connecting rod, and the second connecting rod is connected with a fourth connecting rod; the third connecting rod and the fourth connecting rod are articulated together and connected to a nut; the nut is arranged on a screw rod; the screw rod is connected with a rotary gear driving the screw rod to rotate; knot tying mechanisms areboth arranged on the first connecting rod and the second connecting rod; each knot tying mechanism comprises an opening gear, and the opening gear drives the steel wires to rotate and is sleeved outside an opening ring; the opening ring is fixed on a knot tying table; and the opening gear is connected with a gear transmission pair driving the opening gear to rotate in a meshing way.