The invention discloses a collision prevention detecting device applied to automatic driving. The collision prevention detecting device comprises automobile tires, an automobile brake pad, an automobile front gear hoop, an automatic brake box, an automobile driving battery, an automobile front windshield and a liquid crystal display screen, wherein the automobile driving battery is installed abovea distance detector, the automobile front windshield is installed above the automobile driving battery, the liquid crystal display screen is installed above the automobile front windshield, a signalreceiver is installed below the liquid crystal display screen, an automobile trunk cover is installed below the signal receiver, a rearview probe is installed below the automobile trunk cover, an intelligent processing box is installed below the rearview probe, and an infrared scanner is installed in the rearview probe. The collision prevention detecting device has the advantages that distances ofan electric automobile in all directions can be measured and sensed to remind a driver, and fire outbreak or explosion of an electric automobile battery can be effectively prevented.