A linear-type azobenzenepolyoxyethylene ether nonionic surfactant (PEP-600) was synthesized by p-benzeneazophenol, 1,2-dibromoethane and polyethylene glycol (PEG600), used as a foam stabilizer, to reversibly photo-control foam stability. PEP-600 was characterized by FT-IR spectra and 1H-NMR spec-trum. Besides, its surface activity and foam properties were analyzed. The results showed that the critical micelle concentration (CMC) of PEP-600 was 4.99×10-3 mol/L and the surface tension was 48.09 mN/m at this concentration. The surface excess and HLB value of PEP-600 were 2.48×10-3 mmol/m2 and 14.20, respectively. Meanwhile, the foaming ratio of PEP-600 was about 12 and foam half-life was 220 s with sodium dodecyl sulfate (0.1 g·L-1), meaning that PEP-600 owned the excellent foaming property, which was attributed to the tight arrangement at the surface of foam film. PEP-600 had the potential to apply in foam dyeing as a foam stabilizer.