The invention discloses a laying device of a linear temperature-sensitive fire detector. The laying device comprises a fixing component, a clamping component arranged on the fixing component, and a fastener fixed at the end portion of the fixing component, wherein a clamping cavity for fixing the linear temperature-sensitive fire detector is formed in the clamping component. The problem that in the prior art, a fire detector is damaged due to improper laying is effectively solved, only the fixing component needs to be clamped in a groove in the inner side of C-shaped steel of a cable support during installation, the construction difficulty is small, operation is convenient, and the position of the fire detector is easy to adjust.