The invention discloses a once pressing wiring assembly which comprises a cylinder assembly, a cross beam, pneumatic grippers and joint assemblies. The pneumatic grippers are fixedly arranged at the lower end of the cross beam, the upper end of the cross beam is connected with an extensible end of the cylinder assembly, two moving ends of each pneumatic gripper are respectively connected with a double-end pressing rod, and one end or two ends of each double-end pressing rod are respectively provided with the joint assemblies. The additionally arranged double-end pressing rod can be connected with the two joint assemblies, accordingly two pairs of joint assemblies can be arranged on one pneumatic gripper, a mutual inductor can be pressed between every two adjacent pneumatic grippers, further the quantity of the pneumatic grippers is reduced and cost is reduced. The once pressing wiring assembly is applicable to mutual inductor detection.