The invention discloses a mini-tiller transmission mechanism. The mini-tiller transmission mechanism comprises main shafts and auxiliary shafts parallel to the main shafts. The main shafts comprise the first main shaft and the second main shaft which are arranged on the same straight line. The first main shaft is sleeved with an input gear. The second main shaft is fixedly sleeved with a first drive gear, and a main shaft duplicate gear is arranged in a sleeving manner. The auxiliary shafts comprise the first auxiliary shaft and the second auxiliary shaft. The first auxiliary shaft, the second auxiliary shaft and the main shafts are parallel. The first auxiliary shaft is movably sleeved with an auxiliary shaft duplicate gear and fixedly sleeved with a rapid gear driven gear and a slow gear driven gear. The second auxiliary shaft is movably sleeved with a reverse gear. The input gear is provided with a first shifting fork mechanism. Conversion of the high input speed and the low input speed is achieved through control over the sliding of the input gear via the first shifting fork mechanism, and reverse switching is achieved through sliding of the main shaft duplicate gear and sliding of the reverse gear. By means of the structure, four forward gears different in speed and two reverse gears different in speed are provided, the mini-tiller transmission mechanism is suitable for various farming production situations, and the actual production requirement is met.