The invention provides a catenary suspension string preplanning platform. The catenary suspension string preplanning platform mainly comprises an electric control device, an automatic wire sending and cutting device, a left copper sleeve pushing device, a right copper sleeve pushing device, a suspension string length control device, a hydraulic system, a suspension string tension presetting device and a reversing pressing ring device. The platform can intelligently control the procedures of automatically feeding the suspension string, penetrating a crimping pipe in a positive direction, encircling a heart-type ring, penetrating the crimping pipe in a negative direction, adjusting the tension of a stranded wire according to a preset value, determining the length of the stranded wire according to a preset value, automatically crimping a mechanical device, cutting off the wire according to the length requirement and the like, so that the manual intervention is reduced to the maximum extent. The catenary suspension string preplanning platform has the characteristics of high efficiency, high precision, high automation degree and the like as the traditional manual processing is replaced by mechanical intelligent production, can solve the problems such as poor precision, low efficiency and high reject rate existing in the current manual preplanning efficiently, can make up the blank of research in related fields at home and abroad, and can realize mechanical and professional construction of key procedures of the catenary construction.