All-cellulose composites are high performing green materials and solvent infusion processing makes their upscaled manufacturing possible. This study explored the use of aqueous 7wt.% NaOH/12wt.% urea solution as cost effective and environmentally friendly cellulose solvent for solvent infusion processing. A short dissolution time of 5min led to all-cellulose composite laminates with a tensile strength of 114±1.9MPa and a Young’s modulus of 7.8±0.5GPa. A decrease of tensile strength and Young’s modulus with increasing dissolution time from 5 to 60min was linked to changes in composite microstructure and fine structure of the reinforcing rayon fibres. It was shown that aqueous NaOH/urea solution is a promising alternative solvent, as it offers the advantages of shorter processing times and reduced solvent costs by 97%, while resulting in 25% stronger laminates, when compared to using ionic liquids.