Abstract: A handheld electric packing machine having a strap press structure, vibrating component, cutter, and strap press spacer matching the strap press structure. The strap press structure connects to the vibrating component or is part of the vibrating component. The vibrating component is a swing vibrating component capable of rising and falling. The machine has a downward pressing mechanism and rising reset mechanism for the vibrating component. The vibrating component swings leftward and rightward relative to the lengthwise direction of a packing strap. The machine has a leftward and rightward swing driving device for the vibrating component. The machine has a manually downward pressing operating mechanism with a lock, which is locked when the vibrating component is pressed downwards until the strap press structure is located at a strap press position. The downward pressing operating mechanism cannot retreat after the manually downward pressing is removed.