Aiming at the problems of low sensor acquisition accuracy, poor field motion control accuracy, and high energy consumption of traditional hydraulic system, the existing high ground clearance seedling information collection robot is designed in this paper with adjustable wheel pitch. An energy saving control system based on adaptive energy saving sensing mechanism of electro-hydraulic steering and programmable logic controller is developed. In order to verify the control accuracy and energy saving effect of the robot, motion control test and energy saving test were carried out. The results show that the maximum steady state error of the left and right front wheel steering angle of the high ground clearance robot is 0.7° and 0.9° respectively, and the average error is 0.75% and 0.87% respectively, which realizes the precise steering control of the high ground clearance robot. Compared with the traditional hydraulic system energy saving 65.4%. In order to improve the collection accuracy, an unmanned collection system for seedling information is designed based on the fusion sensor and Beidou navigation device. During the unmanned collection operation, autonomous navigation and driving can be carried out according to the planned path, and the collected crop images and point cloud data can be displayed in real time on the upper computer interface. Crop growth information can be obtained by processing the collected point cloud and image information.