The invention discloses a processing device for tea leaves. The processing device comprises a fermentation tank, wherein the fermentation tank comprises an air pipe and a tank body which can be overturned up and down around the air pipe; the air pipe penetrates through the tank body; a feeding port and an air exhaust port are formed in the tank body; a cover is arranged on the feeding port; brackets are fixed at the two ends of the air pipe; a mesh screen is arranged on the air pipe located in the tank body; through holes are formed in the mesh screen; an air vent is formed in the air pipe in the mesh screen; an elastic sheet covers on the air vent; a gap is formed in the elastic sheet. According to the invention, the traditional fermentation device is used for replacing the fermentation tank and the processing device is clean, hygienic and capable of reducing labor efficiency and is beneficial to the reduction of production energy consumption and labor intensity, so that the production cost can be lowered. The unique fermentation tank, the conveying device and the drying device are designed, all the devices are used cooperatively and the quality of the tea leaves can be guaranteed in the manner of controlling the feeding volume, promoting the uniformity coefficient of fermentation and controlling the drying temperature.