The invention discloses a temperature sensing cable for a linear temperature sensing detector, and belongs to the field of wires and cables. A temperature sensing cable for a linear temperature sensing detector comprises an inner protective layer, and three cable cores arranged in an inverted triangle shape are arranged in the inner protective layer. An inverted-Y-shaped rubber framework is further arranged in the inner protective layer. The three cable cores are all attached to the inverted-Y-shaped rubber framework. Each cable core comprises a first conductor and a second conductor attachedto each other, a first fireproof layer wrapping the first conductor and the second conductor, and a first shielding layer wrapping the first fireproof layer, wherein the first conductor and the secondconductor are each wrapped by a thermosensitive insulating layer. An alarm can be issued automatically when the temperature of the cable is too high. The cable has a good shielding effect, high anti-interference capability, good flexibility and high tensile strength, and can adapt to various complex environments such as high and low temperature, corrosion and moisture. The applicability of the cable is improved.