The disposal of carrageenan industrial waste residues at landfill sites not only causes environmental pollution but also wastes valuable resources, such as the carrageenan oligosaccharides and perlite contained within the waste. To realize the recovery of carrageenan oligosaccharides and perlite from carrageenan industrial waste residues, response surface methodology was used to optimize the conditions for the enzymatic hydrolysis of 2 g of industrial waste residues using κ-carrageenase. The optimal conditions were determined to be as follows: liquid-to-solid ratio, 57 mL•g-1; stirring speed, 500 r•min-1; κ-carrageenase amount, 20 U; reaction temperature, 41 ℃; pH, 8.0; and reaction time, 30 min. Using liquid chromatography-mass spectrometry (LC-MS), the recovered enzymatic products were identified as carrageenan disaccharides and tetrasaccharides. Additionally, single-factor experiments were performed to ascertain the optimal conditions for the cellulase hydrolysis of 4 g of industrial waste residues. These conditions were determined to be as follows: liquid-to-solid ratio, 40 mL•g-1; stirring speed, 500 r•min-1; cellulase amount, 200 U; reaction temperature, 50 ℃; pH, 4.0; and reaction time, 2 h. On the basis of these findings, additional single-factor experiments were performed to determine the optimal process conditions for recovering perlite through hydrochloric acid treatment. These conditions were determined to be as follows: reaction temperature, 90 ℃; hydrochloric acid concentration, 0.2 mol•L-1; and reaction time, 2 h. Under these conditions, the recovered perlite exhibited a permeability of 7.36 Darcy and a bulk density of 0.207 g•cm-3, meeting the national standard for perlite filter aids. In conclusion, the successful recovery of perlite via stepwise enzymatic hydrolysis combined with acid treatment demonstrates the potential for the recycling of carrageenan industrial waste. These findings provide theoretical support and a technical reference for realizing the comprehensive utilization of seaweed industrial waste residues by leveraging enzymatic technology.