The present invention eliminates the flow resistance of the cooling water induced by the pellets by simplifying the structure so that the operation of the wax according to the cooling water temperature is very sensitive, thereby improving the cooling efficiency, The present invention relates to a cooling water temperature control device for controlling a cooling water temperature,;And the valve 46 is opened or closed by making the wax in the pellet 44 expand and contract by being brought into contact with the cooling water guided from the cylinder head to adjust the flow direction of the cooling water,;A frame 43 fixed at the center thereof to the outer peripheral surface of the pellet 44 and having an outer circumferential end inserted and fixed between connection ends between the case 41 and the cover 42;;A valve (46) fixed to an end of the piston (45) of the pellet (44), the outer peripheral end of which is in close contact with the frame (43);;And a return spring 47 is provided between the cover 42 and the valve 46 so that the valve 46 can be brought into close contact with the frame 43.
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