The utility model discloses a mechanism for testing supporting thermal radiator during coefficient of heat transfer, including locating rack, connecting plate, mount pad, rotational positioning axle and bracing piece, wherein, the locating rack includes a bottom plate and connects the two side locating plates of the left and right sides on the bottom plate perpendicularly, two side locating plate parallel and keep (shenglvehao)at a certain distance away settings each other, and in the region between two side locating plates of mount pad lower extreme embedding, the rotational positioning axle passes mount pad and two side locating plates. The connecting plate is located the locating rack below and is connected with the bottom plate of locating rack, and the upper end of bracing piece is connected on the connecting plate. The utility model has the advantages that the whole structure is simple it is single, be convenient for realize, with low costs, it is convenient that the installation is carried the utility model discloses the thermal radiator is installed on the mount pad when using, rotates round the rotational positioning axle through the control installation seat, can adjust the angle of pitch of thermal radiator, and the simple operation, labour saving and time saving, the facilitate promotion is used.