The utility model relates to a hand-powered automatic dual purpose portable harvesting machine. The utility model comprises a working head, a power output device, a transmission rod, and a fixing device which can cause the utility model to be attached to a human body, wherein, the front end of the transmission rod is connected with the working head, and the back end of the transmission rod is connected with the power output device; the transmission rod is utilized to cause the power to be transmitted to the working head. The front end of an operating rod is fixedly connected with the outer side surface of a casing of a transmission shaft, the back end of the transmission shaft is provided with a connecting head which is matched and connected with a power output shaft. The utility model can effectively overcome the passive situations in the present market that the electric harvesting machine is limited by energy sources, such as accumulator cells, etc., and the harvesting machine needs to be charged repeatedly. The utility model is mainly driven by the hand-powered work; thus, the energy resource is saved greatly, the environmental contamination is reduced. The utility model has the advantages that the small volume and the light weight are realized, the utility model is not limited by the natural environment, the efficiency of hand- powered work is same to the efficiency of a corn cutting machine which uses a micro-motor generally, the easy operation is realized. When grasses with different density or the machine clamping phenomenon are generated, nothing remains but only to add the stress force can solve the problem; so the utility model does not need to be stopped to be processed.