The invention discloses a simple fire hydrant cabinet structure comprising a cabinet body, wherein each of two sides of the cabinet body is connected with a supporting column; the supporting columns are connected with the cabinet body through buckle plates; one side of each buckle plate is fixedly arranged on the cabinet body, and the other side of each buckle plate is buckled on each supporting column; the bottoms of the supporting columns are located on supporting seats which can be dismounted from the supporting columns; each supporting column is provided with a connecting buckle matched with each buckle plate; the top of the cabinet body is provided with a top plate slidably connected to the supporting columns; sliding chutes matched with the top plate are formed in two sides of the supporting columns; the bottom of the cabinet body is connected with a bottom plate; and a fire-proof asbestos structural layer is paved on the inner bottom of the bottom plate. The simple fire hydrant cabinet structure is convenient to use and carry, simple in operation, easy to assemble and capable of better absorbing dense smoke generated by a fire, purifying the air, lowering the temperature of ambient air and playing a role in controlling fire behaviors.