Degradable environment-friendly polyolefin thermal contraction film and preparation method thereof

The invention provides a degradable environment-friendly polyolefin thermal contraction film and a preparation method thereof. The degradable environment-friendly polyolefin thermal contraction film comprises an outer layer, a core layer and an inner layer which are stacked in sequence. The preparation method of the degradable environment-friendly polyolefin thermal contraction film comprises thesteps that all layers of raw materials are mixed according to a proportion and then melted and plastified through a single screw extruder separately, and a multi-layer parallel conical die head is used for multi-layer co-extrusion to obtain a multi-layer melt; the multi-layer melt is inflated to obtain film bubbles, and a shape setting water sleeve is used for cooling and shape setting to obtain adisposable huffing film pipe of a multi-layer structure; the disposable huffing film pipe is subjected to water removal, heated through a far-infrared ceramic oven, subjected to foaming, inflation and huffing, subjected to sy