Abstract: The 4H-2 model peanut harvester was developed with new principle. In the article the 4H-2 model peanut harvester is regarded as the testing object. The change scales of load about peripheral force, centripetal force and torque were collected through the load experiment. On the basis of the testing results, the load self-power spectrum of the 4H-2 model peanut harvester was analyzed. The analytical result shows, the transmission system formed by the reverse parallelogram framework realizes the balance of two-side load, while the distribution of spectrum is concentrated and the work status is steady.