The invention aims to provide a cable type linear temperature-sensing detector for sectionally monitoring a temperature-sensing electric signal with multi-circuit, consisting of a closed-circuit signal acquisition circuit formed by an electric signal detection device and a terminating resistance which are connected with two ends of a temperature-sensing cable respectively. The temperature-sensingcable has two or more than two detecting conductors which are sectionally coated with an NTC characteristic material layer and an insulation material layer respectively; the length of each section detecting conductor coated by the insulation material layer is twice the length of each section detecting conductor coated by the NTC characteristic material layer; two detecting conductors with coatings are alternately arranged, the arrangement can be parallel, intertwisted or wound;, and a conducting layer is wrapped or extruded, and an outer restrictive coating is extruded to manufacture the temperature-sensing cable. The cable type linear temperature-sensing detector can realize functions of differential temperature warning, fixed temperature warning, differential-fixed temperature warning, and the warning for short circuit, open circuit and outage failure, and can be used repeatedly.