Portable hand-cranking inflator

The invention relates to a portable hand-cranking inflator. The portable hand-cranking inflator is structurally characterized in that an air cylinder is arranged in an inner cavity of a barrel, a centrifugal pendulum flywheel is arranged on the upper portion of the air chamber and is connected with an inflation piston through a connecting rod, and a spring is arranged below the inflation piston; an air outlet is formed in the lower portion of the barrel and connected with a valve element through a rubber tube; and a hand-cranking handle is arranged on the barrel, and connected with the centrifugal pendulum flywheel. The problem that a traditional inflator wastes time and labor can be solved, carrying is easy, and therefore the aim that the inflator can be conveniently and rapidly used is achieved.