The invention discloses a vehicle body leveling device for a mountain agricultural robot. The vehicle body leveling device comprises an upper limit switch (1), a fixed rod (2), a lower limit switch (3), a movable vehicle frame (4), a tilt-angle sensor (5), a vehicle body (6), a single-rod piston hydraulic cylinder (7) and a fixed vehicle frame (8). The upper limit switch (1) is fixed at the upper end of the fixed rod (2). The lower end of the fixed rod (2) is fixed on the fixed vehicle frame (8). The lower limit switch (3) is fixed on a cylinder body of the single-rod piston hydraulic cylinder (7). The tilt-angle sensor (5) is fixed at a position under the center of the movable vehicle frame (4). A piston rod of the single-rod piston hydraulic cylinder (7) is fixed on the fixed vehicle frame (8). The cylinder body of the single-rod piston hydraulic cylinder (7) is fixed with the movable vehicle frame (4). The vehicle body leveling device provides equipment support for realizing automatic leveling or remote-controlled leveling of the vehicle body of the mountain agricultural robot, and improves the adaptability of the mountain agricultural robot under complex environment conditions.