There are many functional applications based on hydrogel material, including tissue engineering, energy storage, and flexible devices. The main structure was constructed by polyvinyl alcohol, chitosan and agarose. Hydroxyethyl cellulose was added to enhance plasticity and maintain moisture. Carbon quantum dots were added to bring fluorescent property. The multi-network hydrogel had excellent self-healing properties and excellent tensile strength up to 33 MPa and the self-healing could take place quickly in a variety of media. The self-healing efficiency in air reached up to 93% in just 60 s. The result show that the fluorescence intensity of the hydrogel is negatively correlated with the pressure on the surface, and is positively correlated with its tensile elongation. The data fitting confirmation that the tensile elongation can be monitored by detecting the fluorescence intensity of the hydrogel, and combine composite hydrogel with gecko-like structure to form a pressure detector that can adhere to various surfaces. The liquid pressure is confirmed to be monitored by detecting the fluorescence intensity of the device. This research expands the application of fluorescent hydrogel materials and expects to be used for pressure detection under liquid and engineering structure failure monitoring.