The invention relates to a clamp, in particular to a bidirectional moving clamp wide in length adaptive range. The bidirectional moving clamp wide in length adaptive range comprises a base plate, a left clamping base assembly, a movable rack assembly, a right clamping base assembly, a push-pull rod and retaining pawl assemblies. A left clamping plate and a right clamping plate can be moved at thesame time, and the bidirectional moving clamp can adapt to clamping of objects of a wide length range, can be locked by a ratchet wheel and has the function of straightening iron wires. A lead screw base, a lead screw and first trapezoidal convex strips are arranged on the base plate, wherein the lead screw base is fixedly connected to the left end of the base plate, the lead screw is rotationallyconnected to the lead screw base through a bearing, and the two first trapezoidal convex strips are fixedly connected to the upper end of the base plate. The two retaining pawl assemblies are arranged at the right end of the base plate.