A kind of preparation method and applications of polyethylene film

The invention discloses a kind of preparation method of polyethylene film, comprise the following steps：1) it is that the major catalyst in catalyst system is transported in reactor by carrier logistics with mixing liquid I, the mixing liquid I includes alkane, alkene and co-catalyst；Stream I II is obtained after supplement olefin feedstocks are added into the stream I I flowed out from reactor, stream I II is divided into stream I IIa and IIIb, stream I IIa and IIIb are back to sidepiece and the bottom of reactor respectively；In the reactor, it is aggregated to obtain ethene polymers and discharged from reactor；Wherein, the alkene includes the mole specific concentration ratio at least 1 of alhpa olefin and ethene in alhpa olefin and ethene, the mixing liquid I；2) by step 1) made from ethene polymers by blow molding process, obtain polyethylene film.The method provided according to the present invention improves the tack of gained film, reduces mist degree.