The invention discloses a low-
smoke halogen-free aging-resistant insulated cable and a preparation method thereof, belongs to the technical field of cable preparation, and is used for solving the technical problem that the
smoke suppression performance and the
aging resistance of a sheath layer of an insulated cable in the prior art need to be further improved. The preparation method specifically comprises the following steps: mixing
polypropylene, SBS-g-MAH, modified nanoparticles, a
flame-retardant modified
monomer, an initiator and an auxiliary additive, adding the mixture into a double-screw extruder, melting the mixture, extruding the melt mixture and
coating the melt outside a wrapping layer to form a sheath layer, thereby obtaining the insulated cable. The modified POSS and the phenolic resin are mixed to prepare the modified microspheres, and the
nickel acetate solution is further introduced for complexing deposition to obtain the modified nanoparticles, so that not only are the
smoke suppression performance and the
flame retardant performance of the insulated cable sheath layer improved, but also the mechanical performance and the
thermal aging resistance of the cable sheath layer are improved.