The invention relates to a tea garden rotary cultivator, comprising a frame, a power device, a rotary blade, and a walking wheel, wherein a fixed mount is arranged below the frame, the walking wheel is arranged below the frame and in front of the rotary blade, a depth limiting rod is arranged behind the rotary blade and below the frame, the upper and lower positions of the depth limiting rod on a locating sleeve are adjustable, and an arc plate is arranged below the depth limiting rod; and the power device comprises a diesel engine and a speed reducer, the rotary blade is provided with a driven disc which is connected with a driving disc on the speed reducer through a transmission chain A, and the driven disc is connected with a driving disc on the walking wheel through a transmission chain B. The tea garden rotary cultivator provided by the invention is suitable for loosening soil and plowing in a tea garden, the diesel engine provides power to ensure that the walking wheel and the rotary blade are driven to rotate so as to achieve walking and plowing of the rotary cultivator, wherein by adjusting the upper and lower positions of the depth limiting rod, the depth of soil tillage is controlled, manpower is saved, and the efficiency of plowing and loosening the soil is increased.