The invention discloses seven novel 2,2'-dipyridine bridged bis-triazine compounds, particularly 6,6'-di(5,6-dialkyl-1,2,4-triazinyl-3-yl)-2,2'-dipyridine compounds with the side chain alkyl group of isobutyl, 3-methylbutyl, 4-methylamyl, 3-methylhexyl, 5-methylhexyl, 2-cyclopentylethyl or 2-cyclohexylethyl group and a preparation method thereof.2,2'-dipyridyl-6,6'-diiminohydrazide and alkyl substituted alpha-dione used as initial raw materials are heated to perform dehydration cyclization reaction for 5-24 hours by using tetrahydrofuran / triethylamine as a reaction solvent, thereby obtaining the seven 6,6'-di(5,6-dialkyl-1,2,4-triazinyl-3-yl)-2,2'-dipyridine compounds. The method has the characteristics of mild conditions, accessible raw materials, high target product yield and the like, and is simple to operate.