The invention discloses an automatic load bearing contact device for testing color fastness based on hot air circulation system temperature control. The automatic load bearing contact device is characterized by comprising a base plate and a temperature preservation shell, wherein the base plate in the temperature preservation shell is provided with an automatic load bearing testing mechanism which is composed of an objective detection platform and a panel-type testing weight capable of lifting or being pressed and put on the platform; the objective detection platform moves horizontally by the control of a horizontal air cylinder and can be pushed out by a starting-closing door at the other side of the temperature preservation shell; circulation hot air ducts are configured at the upper end of the temperature preservation shell and the lower part of the base plate, and hot air inlets and hot air outlets are respectively formed in the temperature preservation shell and the base plate; the temperature preservation shell is internally provided with a temperature sensor. The automatic load bearing contact device has the extinguished characteristics that circulation hot is utilized for keeping the constant temperature in a testing cavity; the whole process is nearly not affected by the external environment temperature; the stability and reliability of the whole detection method are improved; the device can be widely applied to the detection analysis process of the color fastness in industries of textile, papermaking and the like.