In this study, central pull-out tests were conducted on 12 specimens of rebar confined by flat corrugated duct grout and 3 specimens of rebar confined by circular corrugated duct grout to investigate the bond-slip performance between the rebar and the grout. The effects of grout strength, rebar diameter, and corrugated duct dimensions and shape on the bond-slip performance were analyzed and elucidated. The test results show that: the bond performance is improved with the increase of grout strength and the minor axis dimension of flat corrugated ducts, as well as the decrease of rebar diameter; specimens with relatively large rebar diameter and small short-axis dimension of the flat corrugated duct are prone to concrete splitting failure along the long-axis direction of the corrugated duct. The bond performance of specimens with circular corrugated ducts is higher than that of specimens with flat corrugated ducts. Based on the test data, a bond-slip constitutive model applicable to rebar confined by flat corrugated duct grout was established, and calculation formulas for the characteristic parameters were provided. This study can provide experimental evidence and theoretical reference for the application of flat corrugated duct grouted connection technology in thin-walled precast components.