The Low-Density Polyethylene (LDPE) with melting index MI=2~7 is used as the main raw material in the bubble film machine. The Linear Low-Density Polyethylene (LLDPE) with melting index MI=1.0~1.5 can be added in proper proportion, and the regenerated LDPE with melting index equivalent to MI=2~4 can be partly or completely used as the raw material so as to make bubble film of a certain width.