The utility model relates to a 52 fire -retardant transmission cable of synthesizing of core, arrange two layers of cable core of 9 0.35mm2 insulated conductors IV transposition constitutions in proper order outside two hank shielded wire one deck cable cores, 14 root 0.35mm2 insulated conductors IV and an insulation shielding line transposition constitution three -layer cable core, the shielding isolation layer, 8 root 2.5mm2 insulated conductors II and one eradicate and to constitute the four layers cable cores along paired line and two 1.0mm2 insulated conductors I transposition, 8 root 4.0mm2 insulated conductors III and 6 2.5mm2 insulated conductors II and one fill out the core transposition and constitute five layers of cable core, the isolation layer, total shielding layer, the sheath. The effect is: comprehensive structural design has been broken through to this cable, satisfies the requirement of multicore, multilayer structure, many electric properties, light in weight, and occupation space is big, the installation operation of being convenient for, the whole system has higher environmental suitability and reliability level, has satisfied user's operation requirement.