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In order to enrich the kind of teas being produced, and improve the utilization of fresh tea materials, a multi-functional preprocessing machine for fresh tea was developed which could realize spreading of green tea, withering of black tea, and green-making of oolong tea. The general structures as well as the working principle of some key parts like mechanical transmission system, leaf turning device, ventilation and heating system were introduced. With multi-branch pipe for air intake, the uniformity of wind field was ensured; pump with high pressure and low flow rate, together with small spray nozzle ensured the uniformity of moisture; temperature was accurately controlled according to different layers. Experimental results show that teas produced with this machine had higher physical and chemical indexes and scores compared to the control groups. The results show that the design was reasonable, and the machine was reliable.