A method for co-producing various alkenyl halides and hydrofluoroalkanes, characterized in that comprising following steps of: (a) introducing cis-1-chloro-3,3,3-trifluoropropene into a first reactor where an isomerization reaction occurs in the presence of a first catalyst to obtain a first reactor reaction product, wherein the first catalyst is alumina-loaded chromium and magnesium, wherein the load of chromium is 3-8wt%, and the load of magnesium is 1-3wt%, a temperature of the isomerization reaction is 200-400°C, and an air velocity of the isomerization reaction is 300-1000 h -1; (b) introducing the first reactor reaction product obtained in the Step (a) into a first rectification column to obtain a product of trans-1-chloro-3,3,3-trifluoropropene and a first rectification column bottom liquid; (c) mixing 30-70 wt% of the trans-1-chloro-3,3,3-trifluoropropene obtained in the Step (b) with hydrogen fluoride, and then introducing the trans-1-chloro-3,3,3-trifluoropropene and the hydrogen fluoride in a second reactor where a reaction occurs in the presence of a second catalyst to obtain a second reactor reaction product, wherein a composition of the second catalyst comprises, by mass percentage, 73-90% of chrome oxide, 9.5-25% of zinc oxide, and 0.5-2% of gallium oxide, a molar ratio of the hydrogen fluoride to the trans-1-chloro-3,3,3-trifluoropropene is 8-20:1, a temperature of the reaction is 180-400°C, and a space velocity of the reaction is 300-1000h -1; (d) introducing the second reactor reaction product obtained in the Step (c) into a phase separator for separation to obtain an inorganic phase and an organic phase; (e) introducing the organic phase obtained in the Step (d) into a second rectification column to obtain a trans-1,3,3,3-tetrafluoropropene product and a second rectification column bottom liquid; (f) introducing the second rectification column bottom liquid obtained in the Step (e) into a third rectification column to obtain a cis-1,3,3,3-tetrafluoropropene product and a third rectification column bottom liquid; and (g) introducing the third rectification column bottom liquid obtained in the Step (f) into a fourth rectification column to obtain a 1,1,1,3,3-pentafluoropropane product and a fourth rectification column bottom liquid. (a) introducing cis-1-chloro-3,3,3-trifluoropropene into a first reactor where an isomerization reaction occurs in the presence of a first catalyst to obtain a first reactor reaction product, wherein the first catalyst is alumina-loaded chromium and magnesium, wherein the load of chromium is 3-8wt%, and the load of magnesium is 1-3wt%, a temperature of the isomerization reaction is 200-400°C, and an air velocity of the isomerization reaction is 300-1000 h -1; (b) introducing the first reactor reaction product obtained in the Step (a) into a first rectification column to obtain a product of trans-1-chloro-3,3,3-trifluoropropene and a first rectification column bottom liquid; (c) mixing 30-70 wt% of the trans-1-chloro-3,3,3-trifluoropropene obtained in the Step (b) with hydrogen fluoride, and then introducing the trans-1-chloro-3,3,3-trifluoropropene and the hydrogen fluoride in a second reactor where a reaction occurs in the presence of a second catalyst to obtain a second reactor reaction product, wherein a composition of the second catalyst comprises, by mass percentage, 73-90% of chrome oxide, 9.5-25% of zinc oxide, and 0.5-2% of gallium oxide, a molar ratio of the hydrogen fluoride to the trans-1-chloro-3,3,3-trifluoropropene is 8-20:1, a temperature of the reaction is 180-400°C, and a space velocity of the reaction is 300-1000h -1; (d) introducing the second reactor reaction product obtained in the Step (c) into a phase separator for separation to obtain an inorganic phase and an organic phase; (e) introducing the organic phase obtained in the Step (d) into a second rectification column to obtain a trans-1,3,3,3-tetrafluoropropene product and a second rectification column bottom liquid; (f) introducing the second rectification column bottom liquid obtained in the Step (e) into a third rectification column to obtain a cis-1,3,3,3-tetrafluoropropene product and a third rectification column bottom liquid; and (g) introducing the third rectification column bottom liquid obtained in the Step (f) into a fourth rectification column to obtain a 1,1,1,3,3-pentafluoropropane product and a fourth rectification column bottom liquid.