The invention discloses a fire hazard warning device based on wireless control. The warning device comprises a bottom end, supports are arranged symmetrically at the two sides of the bottom end respectively, a first fixed block of a hollow structure is arranged between the supports, and the first fixed block is internally provided with a smoke sensitive detection unit and a temperature detection unit. A first motor is additionally arranged to rotate a second fixed block horizontally; a second motor is additionally arranged to rotate a fourth fixed block vertically; the smoke sensitive detection unit, the temperature detection unit, a camera, a night vision infrared light device, a microphone, a player and a wireless receiver and emitter are additionally arranged so that installation and construction can be easy and a fire hazard alarm is easier to discover; and it is not required to assign a firefighter to observe the fire hazard condition onsite, the working efficiency is improved, the working intensity of firefighters is reduced, the life and property safety of people are protected, a lot of matched equipment can be omitted, and the construction cost is reduced.