5 are provided at a right or left lateral of the control box 2 while the receiving portions 51 and the connecting port 53 of the fastening device 5 are provided at a left or right lateral of the cooling unit 3 therefore to assemble the control box 2 with the cooling unit 3 the left or the right lateral of the control box 2 is set beside the right or the left lateral of the cooling unit 3 so as to couple the receiving portion 51 with the projecting portions 52 and the connecting port 53 with the connecting slot 54 afterward one end of the gas tube 4 is connected to the vent 20 of the control box 2 and an opposite end of the gas tube 4 is connected to the vent 20 of the cooling unit 3 at last the connecting port 210 of control panel 21 is connected to the connecting slot 211 of the control box 2 and the configurable refrigerator 1 of the present invention is completed as can be seen in fig8 9 and 10 which are a partially exploded view and schematic assembled views of a second preferred embodiment of the present invention the configurable refrigerator i comprises a control box 2 two cooling units 3 a plurality of gas tubes 4 and fastening device 5 therein the control box 2 and the cooling units 3 are vertically stacked in the present embodiment the projecting portions 52 and the connecting slots 54 of the fastening devices 5 are provided at the bottoms of the control box 2 and the cooling unit 3 respectively while the receiving portions 51.