Fire-fighting exhaust safety channel system of house building

The invention discloses a fire-fighting exhaust safety channel system of a house building, wherein starting from the principles of hydromechanics and thermodynamics, a fire-fighting exhaust safety window is arranged at the topmost end position of the vertical wall or the roof of each room of the house building, a subchannel which is provided with an upward opening and communicated with the fire-fighting exhaust safety window is arranged outside the fire-fighting exhaust safety window, the opening part of the subchannel is lower than the lowest end part of the subchannel of a room at an upper story corresponding to the room, the subchannel of each room at the upper story and the lower story is communicated with a main channel, and the outlet of the main channel is arranged at the rooftop of the house building; and a wind cap moving along with the wind is arranged at the opening part at the top end of the channel, i.e. the chimney effect well known in life. The invention can improve the departure environment of