Computer mainframe internal radiating structure

The utility model relates to a heat radiation structure arranged in a host of a computer, wherein a wind guide cover is combined to a side plate of a housing of the host or the wind guide cover is arranged on a heat radiation module of a central processing unit (CPU). When the housing of the host is matched with different host plates, the position of the central processing unit (CPU) arranged on the host plate is changed along with the different host plates. The wind guide cover can effectively face heat radiation holes arranged on the housing of the host, cold air is led into to carry out heat radiation, hot air in the housing of the host is avoided to reflux into the heat radiation module combined on the central processing unit (CPU), and direct temperature reduction of the central processing unit (CPU) can be achieved. When the wind guide cover is arranged on the housing of the host, a gap between the wind guide cover and the heat radiation module is formed, a baffle plate is arranged to reduce the refluxing of hot air quantity to reduce the temperature of the central processing unit (CPU) by outside cold air.