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Aiming at the problems of large size, cumbersome operational procedures, and poor maneuverability of agricultural chassis currently for hilly orchard, as well as the practical requirements of cultivation management tasks such as trenching, weeding, and pruning in hilly orchards, a hydraulic remote control crawler power chassis was designed. Firstly, the overall structure and working principle of the power chassis were described. Secondly, key components such as the front-mounted mechanism, walking system, variable-width chassis, hydraulic system, and remote control system were designed and appropriately matched. Finally, performance tests were conducted on the entire machine. The tests revealed that the deviation rates of the power chassis during straight-line travel at the minimum width (1220mm) and maximum width (1620mm) were 2.24% and 2.2% respectively, both satisfying the corresponding national standards (≤6%) requirements. The chassis exhibited good steering maneuverability, with a minimum width turning radius of 905mm, enabling it to adapt to the narrow slope working environment of hilly orchards. The remote control operation demonstrated smooth processes such as ascending and descending slopes, crossing field ridges, and traversing furrows, meeting the requirements of walking on unstructured terrain in hilly orchards. When equipped with a mounted chain-type ditcher for trenching operations, the stability coefficient of trench depth was 885%, and the stability coefficient of trench width was 92.5%, both meeting the national standards (≥85%) requirements. The overall performance of the machine met the demands of managing complex sloped terrains in hilly orchards, providing a comprehensive application platform and technical support for the effective implementation of field management operations in hilly mountainous orchards.