The invention relates to a harvest attitude control system of a peanut combined harvester, and belongs to the technical field of agricultural machinery. A harvest table frame of the system is fixedly connected with a left harvest table, a cylinder body of a main hydraulic cylinder is installed on a chassis frame in a hinging manner, and a piston stretching end of the main hydraulic cylinder is hinged with the harvest table frame; a right harvest table is supported at the right side of the harvest table frame in a hinging manner, a cylinder body of a right hydraulic cylinder is installed at the right side of the harvest table frame in a hinging manner, and a piston rod stretching end of the right hydraulic cylinder is hinged with the right harvest table; and a signal output end of a sensor is connected with corresponding signal input ends of an intelligent device in a control circuit respectively, and corresponding control signal output ends of the intelligent device are connected with controlled ends of the main hydraulic oil cylinder and the right hydraulic oil cylinder respectively. The harvest height of the harvest attitude control system disclosed by the invention is subjected to two-stage floating adjustment, the intelligent control circuit is capable of realizing comprehensive adaptive regulation and control for various complex working environments on the basis of respective independent processing and according to acquisition for a sensing signal in various conditions, and invariable left excavation depth and right excavation depth are always kept, thus smooth harvest and harvest quality are ensured.