The invention relates to a quantitative analyzing method for positioning of low-frequency array eddy current. According to the technical scheme, the quantitative analyzing method for positioning of low-frequency array eddy current comprises the following steps: A, detecting and calibrating a waste determining standard; B, carrying out defect positioning; and C, quantifying defects by using a three-dimensional C scanning image processing function. Interference of space scattered leakage magnetic flux is eliminated by a magnetic tank and a magnetic shielding technology of a shielding coil, defect resolving power is improved, in a detecting process, eight detecting coils can be used for imaging independently, detecting sensitivity can be always consistent, leak detection on defects is avoided, probe covered heated surface steel tube inner wall detects can be detected by one-time operation, repeated operations are not required, by the quantitative analyzing method for positioning of the low-frequency array eddy current, by a low-frequency array eddy current probe and imaging and displaying advantages of three-dimensional C scanned stereo images, the problems of positioning and quantifying of corrosion defects of the inner wall of a heated surface tube of a boiler of a power station is solved, the detection precision and field working efficiency are improved, and reliable and stablerunning of the heated surface tube of the boiler of the power station is ensured.