The invention discloses a multipurpose electric bicycle capable of replacing walking and keeping fit. A travelling mechanism, a driving mechanism and a main controller are arranged on a bicycle frame assembly. The travelling mechanism comprises a front rolling shaft, a rear rolling shaft and a travelling conveyor belt, wherein the front rolling shaft and the rear rolling shaft are arranged in the middle of the bicycle frame assembly, the travelling conveyor belt is connected with the front rolling shaft and the rear rolling shaft, and meanwhile a rear shaft gear is arranged at one end of the rear rolling shaft. The driving mechanism comprises a driving motor, a booster sensor, a driving shaft, a driving gear, a first gear, a second gear and a real wheel flywheel, wherein the driving motor, the booster sensor and the driving shaft are arranged at the rear end of the bicycle frame assembly, the driving gear is arranged at the output end of the driving motor, the first gear and the second gear are arranged on the driving shaft, and the real wheel flywheel is arranged on a rear driving wheel and rotates with the rear driving wheel with the same axis. The driving gear and the rear shaft gear are connected through a first chain; the first gear and the upper end of the first chain are engaged; the second gear and the rear wheel flywheel are connected through a second chain; the booster sensor, the first gear and the second gear are located in the same straight line; and meanwhile the driving motor and the booster sensor both are electrically connected with the main controller. The multipurpose electric bicycle capable of replacing walking and keeping fit has the advantage that the purposes of walking replacing and fit keeping are achieved.