The invention discloses an intrinsic-safety type tension sensor for a steel wire rope, and the tension sensor comprises a beam-type resistance strain sensor, guide wheels installed at two ends of the beam-type resistance strain sensor, and a clamping pressurizing device disposed at the center of the beam-type resistance strain sensor. The clamping pressurizing device comprises a rectangular pressure block which is arranged to be perpendicular to the upper surface of the beam-type resistance strain sensor. Two ends of the rectangular pressure block are provided with symmetric through holes, and the interior of each through hole is provided with a screw rod. The tops of the screw rods are spirally connected with nuts and the rectangular pressure block. The bottom ends of the screw rods are fixedly connected with a supporting block. The beam-type resistance strain sensor passes through a space between the two screw rods. The upper end face of the supporting block is provided with an arc-shaped groove which is used for hooking the steel wire rope. The guide wheels and the supporting block are located below the beam-type resistance strain sensor. The tension sensor prevents the decrease of tension from causing slipping of a belt and prevents an overlarge tension from causing the pull deformation of the belt.