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Stem cell therapies have been attracted much attention for the last few decades in the field of regenerative medicine and tissue engineering. 3-dimensional (3D) microenvironment surrounding the transplanted stem cells plays essential roles that influence the cell fate and behaviors. Thus advanced functional biomaterials and extracellular matrix (ECM) replacements with adjustable chemical, mechanical and bioactive properties are requisite in this field. In this study, PEG-based hyperbranched multifunctional homopolymers were developed via RAFT homopolymerization of the divinyl monomer of poly(ethylene glycol) diacrylate (PEGDA). Due to its high degree of multi-acrylate functionality, the hyperbranched polyPEGDA can rapidly crosslink with a thiolated hyaluronic acid at physiological condition and form an injectable hydrogel for cell delivery. In addition, by simply varying the synthesis recipe such as the reaction time and the ratio of the monomer to chain transfer agent (CTA), tunable polymer molecular weight, acrylate functionality degree and the cyclized/hyperbranched polymeric architecture can be finely controlled in one-step reaction. The gelation speed and the mechanical properties of this hydrogel can be easily adjusted by altering the crosslinking conditions. Rat adipose-derived stem cells (rASC) were embedded into the in situ crosslinked hydrogels, and their cellular behavior such as the morphology, viability, metabolic activity and proliferation were fully evaluated. The results suggested the hydrogel maintained good cell viability and be able to easily modify with other bioactive signals, which provide this injectable hydrogel delivery system a decent potential for polymeric biomaterial and tissue regeneration applications.