<p>This study investigates the impact of tensile rates on the stress–strain test results of hydrogels and explores the underlying causes of such impacts. The mechanical properties of hydrogels have always been a focus of research. However, due to their complex composition and structure, there is a lack of universal testing standards. In this work, polyacrylamide (PAM) hydrogels were selected as the research object to explore the variation patterns of their maximum stress and maximum strain at different tensile rates. Experimental results showed that as the tensile rate increased, both the maximum strain and maximum stress of PAM hydrogels exhibited a decreasing trend. To explore methods for reducing the influence of tensile rates, this study introduced cellulose nanofibers (CNF) and graphene oxide (GO) to prepare PAM-CNF and PAM–GO composite hydrogels. Both PAM–CNF and PAM–GO hydrogels exhibited higher mechanical strength and were less affected by tensile rates compared to PAM. In particular, PAM–GO demonstrated a significant increase in elastic modulus, with test results barely affected by tensile rates. This study provides a reference for assessing the mechanical properties of hydrogels and eliminates the influence of tensile rates on test results by enhancing the strength of the hydrogel’s crosslinking network structure.</p>