To solve problems including low leveling precision and poor controllability etc.of paddy field rotary cultivator after plowing caused by tilting and vibration while farming,a set of leveling system consistent with paddy field rotary cultivator was designed on the basis of tilt angle sensor control technology.It realized leveling regulation function by combining hydraulic control with the controller control.The results of field trials showed that the working performance of field rotary cultivator leveling system based on tilt angle sensor technology was practical with its automatic leveling regulation function.The flatness after plowing Sd was 2.20 cm，with elevation difference distribution β of 81.82%. Compared with field rotary cultivator,the field surface roughness was 34.3% and the elevation difference distribution increased 19.4%，indicating that it can basically meet the agricultural requirement of rice planting.