Provided is a method for designing a multifunctional traveling case type solar bicycle based on TRIZ. Sixteen invention principles recommended in the TRRZ are taken as technological development routes for increasing useful functions, and a bicycle is developed into the multifunctional traveling case type solar bicycle. The multifunctional traveling case type solar bicycle comprises pedals, wheels, handlebars, a saddle, a bicycle beam, a traveling case outer shell, a solar cell panel, a storage battery, an electric motor, a transmission speed change mechanism and the like. The multifunctional traveling case type solar bicycle is characterized in that the saddle, the handlebars, the bicycle beam, the wheels and other parts are connected in a flexible mode, can be turned over and can be conveniently folded and overlapped in a sleeved mode, the soar cell panel is arranged on the outer portion of a traveling case, and the bicycle has multiple functions. The multifunctional traveling case type solar bicycle can be supplied with power through solar energy, and be charged through a power source, and can also use manpower as power. After the bicycle is folded and overlapped in the sleeved mode, the bicycle can be put on a luggage rack of a train, below a seat and a trunk of an automobile. The bicycle after being folded and overlapped in the sleeved mode can be pulled as a draw-bar box, can be carried on the shoulders and can also carry dozens of kilograms of articles like a luggage barrow.