The invention discloses a passive downhole cable real-time tension monitoring short section comprising an upper connector, a control base, an intermediate sensor connector and a lower connector which are connected in turn. The intermediate sensor connector is internally provided with a sensor. A lower single core connecting sealing plug is connected on a lower connecting assembly. The sensor is connected with the lower connector through the lower single core connecting sealing plug. The balance piston holes and clamp grooves of the intermediate sensor connector are internally provided with pressure balance pistons. The external circumferential surface of the intermediate sensor connector is provided with countersunk screw holes. The external surface of the lower connector is provided with elliptical through holes. The diameter of the elliptical through holes is greater than that of the countersunk screw holes. The downhole cable head tension can be monitored and uploaded in real time under the passive condition, and a ground winch operator can adjust the winch speed according to the real-time tension data so that the cable head weakness can be more effectively protected, the engineering accident can be avoided, the structure is simple, operation is easy and convenient and the manufacturing cost is low.