The invention discloses an all-terrain mechanical winged insect for surveillance and a working method thereof. The all-terrain mechanical winged insect comprises a basic assembly, a flapping wing assembly, a walking assembly, a power assembly, a visual assembly and a receiving terminal, wherein the basic assembly comprises a frame constructed by a plurality of metal sheets; the flapping wing assembly comprises a rotary wing and a first connection rod group; the walking assembly comprises a grounding claw and a second connection rod group; the power assembly comprises a motor, a battery pack and a gear set, and the gear set is mechanically connected with the flapping wing assembly and the walking assembly; the visual assembly comprises a camera, a night-vision device and an infrared sensor;the receiving terminal comprises a signal processing unit, an image transmission module and a handheld display device. According to the all-terrain mechanical winged insect, an unmanned aerial vehicle and a ground robot are integrated into a robot, the movement of an insect is simulated according to bionics, through the cooperation of the visual assembly, the all-terrain mechanical winged insectis high in flexibility in the field of surveillance, and the all-terrain mechanical winged insect is adapted to various terrains and high in actual combat efficiency.