The invention belongs to the technical field of a high polymer material and the synthesis thereof, and particularly relates to a difluoro diketone monomer containing dipyridyl, a preparation method thereof, and a polyaryletherketone block polymer having a coordination function and containing dipyridyl in a main chain, wherein the polyaryletherketone block polymer is obtained through nucleophilic polycondensation of the 4,4'-Difluoro diphenylmethanone and hexafluoride bisphenol A. The difluoro diketone monomer containing dipyridyl is difluoro diketone which is a compound with a novel structure; and the difluoro diketone monomer containing dipyridyl has the chemical formula of 2,2'-dipyridyl-5,5'-2((4-fluorophenyl)ketone) and can conduct polycondensation with the 4,4'-Difluoro diphenylmethanone and hexafluoride bisphenol A to prepare the novel polyaryletherketone block polymer containing the dipyridyl in the main chain. The functional dipyridyl group is introduced into the molecular structure of polyaryletherketone to obtain the novel soluble polyaryletherketone containing the dipyridyl. The material has the advantages of high thermal stability, relatively strong mechanical property and excellent film formation property. In addition, as an excellent coordination group, the dipyridyl enables the block polymer and rear earth metallic to coordinate to obtain a novel material having a fluorescent property, so that the application field of the polyaryletherketone is expanded.