The utility model relates to a floating cycle of a buried steel pipeline corrosion detector probe for the corrosion measurement of a buried steel pipeline, in particular to the measurement of magnetic variable and the thickness linear size and the pipeline system technology field. The floating cycle is characterized in that the floating cycle [2] is connected with a shaft body [4] through 3-6 articulation mechanisms [3]. The articulation mechanism [3] consists of a connecting bar [7], a stent I [5], a stent II [13], a casing I [11], a casing II [12], bar end joint bearings [6], screws [9] and nuts [8]. The two ends of the connecting bar [7] are respectively connected with a bar end joint bearing [6]. The bar end joint bearing [6] on one end of the connecting bar [7] is positioned on the stent I [5] through the screw [9], and the bar end joint bearing [6] on the other end of the connecting bar [7] is positioned on the stent II [13] through the screw [9]. Through the pipeline corrosion real measurement of prototypes, the floating cycle is proved to be capable of passing through various fittings on the pipeline designed according to the standard smoothly and safely and ensuring the integrity and the accuracy of detection data.