Linear polyethylene glycol (PEG) was added into the cross-linking polymer network of acrylamide and acrylic acid to form semi interpenetrating polymer network structure to improve the mechanical properties of hydrogels. In the hydrogel network, citric acid (CA) and ethylenediamine (EDA) were introduced to form non conjugated fluorescent polymer (NCFP) dots thus preparing polyethylene glycol/poly(acrylamide-co-acrylic acid) PEG/P(AM-co-AA) fluorescent hydrogels with high resilience. The hydrogels have good mechanical strength, toughness, high fluorescence intensity and fluorescence homogeneity, and photoluminescence with metal ion sensitivity. Tensile test results show that the breaking strength of PEG/P (AM-co-AA) fluorescent hydrogel reaches ~192.2 kPa, and it can return to its initial state after stretching four times. The photoluminescence results show that the blue fluorescence of the hydrogels can be excited at the wavelength of 365 nm (emission wavelength: 434 nm - 467 nm). The fluorescence performance has strong Fe3+ sensitivity, and the quenching efficiency can reach 99%. The fluorescent hydrogels have potential applications in flexible electronic devices and biosensors.