The invention discloses a portable garden pruning device which structurally comprises a saw blade, a portable main tank, a gasket, a handle, a control main unit, a safety trigger, a shock absorption rubber ring, a switch button, heat dissipation openings, a rocking handle and movement wheels. The portable garden pruning device has the advantages that a belt transmission device, the rocking handleand a power generation device are connected with one another, and accordingly the portable garden pruning device has a hand-cranking power generation function; the rocking handle can rock to drive thebelt transmission device to move in magnetic fields of the power generation device, magnetic induction line cutting movement is carried out in the magnetic fields, currents can be provided to the power generation device and can be in signal connection with an energy supply device by the power generation device via a connecting cable, accordingly, a pulling mechanism can move, a travel mechanism can be downwardly tightened, a transmission driving mechanism can be started, a rotary motor can be driven by the transmission driving mechanism to clockwise rotate, the portable garden pruning devicehas an ascending function, the problem of difficulty in pruning tall plants can be solved, and the use portability of equipment can be effectively improved.