Thermosetting epoxy resins have been widely used in the field of fine polymer coatings due to their excellent comprehensive property. However, it is still an important challenge to fabricate epoxy resin coatings with mechanical, hydrophobic, and salt spray resistance properties through two-component structure design. In this paper, triethylenetetramine (TETA), epoxy monomer E51 and polyether flexible chain segment (DEG501) were added through ring opening reaction to obtain single flexible segment curing agent (TED), and then modified with dimer acid flexible segment (DA) TED to obtain double flexible segment curing agent (DTED). Subsequently, epoxy monomer E51 was reacted with curing agent TED and DTED respectively, to obtain epoxy resin E51-TED based on single flexible segment and epoxy resin E51-DTED based on double flexible segment . The structures and properties of the two epoxy resins were characterized by FT-IR, _¹H NMR, SEM, TEM, thermogravimetric analyzer, universal tester, salt spray machine and contact angle tester. The results show that the glass transition temperature of epoxy resin E51-DTED reaches 123 °C, the maximum compressive strength can reach 46.564 MPa, the maximum water contact angle can reach 95.7°, and the salt spray resistance can reach up to 96 h, the volume swelling rate in water can reach 0.33%. The introduction of dual flexible segments enables the epoxy resin to exhibit excellent thermal stability, outstanding mechanical properties, good hydrophobicity, water resistance and resistance to salt spray.