PROBLEM TO BE SOLVED: To provide a simple manufacturing method of a cellulose fiber dispersed resin composite which is excellent in energy efficiency (low power consumption), uses a cellulose fiber adhered polyethylene thin film piece with various size and shapes, where a paper component (cellulose fiber) which cannot be removed when polyethylene laminate processed paper having a polyethylene thin film adhered to a surface of paper is stirred in water and a paper part is peeled and removed, adheres ununiformly to a polyethylene thin film as a raw material and can disperse a cellulose fiber in a polyethylene resin sufficiently uniformly with peeling the cellulose fiber from a surface of the cellulose fiber adhered polyethylene thin film piece.SOLUTION: There is provided a manufacturing method of a cellulose fiber dispersed polyethylene resin composite including melting a cellulose fiber adhered polyethylene thin film piece where a cellulose fiber adheres to a polyethylene thin film piece, melting mixing the sa
