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Used in the water cooling system of the 465 series of Japanese bulldozers. The water radiator of the excavator keeps the excavator at a suitable working temperature. This product uses the engineering vehicle radiator of the company's patent to increase the strength of the main board, including the main board, heat pipe, connecting groove, support plate and heat belt. The main board is two parallel pieces and connected to the water inlet chamber and the water outlet chamber respectively. The heat pipe is located between the two main boards and is connected to one main board at both ends. The connecting groove connects the connection between the main board and the heat pipe and the end of the heat pipe is inserted into the connecting groove. The support plate vertically connects the main board to form a frame structure that accommodates the heat pipe, the connecting groove and the heat belt. The heat belt is arranged between the heat pipe and between the heat pipe and the support plate. The two main boards of the utility model are connected to a plurality of heat pipes by increasing the connection groove of the contact surface. Compared with the existing technology, the root contact surface of the heat pipe is increased, thereby increasing the mechanical strength, reducing the probability of tearing of the heat pipe, and extending the service life of the engineering vehicle radiator.