Cooling device for construction machinery

The cooling device comprises hydraulic equipment, a cooling box is detachably connected to the upper end of the hydraulic equipment, two second coil pipes are arranged in the cooling box in a penetrating mode, one ends of the two second coil pipes penetrate through the opposite side walls in the cooling box respectively and extend to the two sides of the cooling box, and the other ends of the twosecond coil pipes are communicated with the cooling box. One ends of the two second coil pipes are both connected with conveying pipes, the two conveying pipes are both connected with hydraulic equipment, a backflow cooling mechanism is arranged on the cooling box, the backflow cooling mechanism is connected with the hydraulic equipment, a stirring mechanism is arranged on the cooling box, and twosecond stirring fans and a first stirring fan are arranged on the stirring mechanism. According to the cooling device, cooling liquid can be cooled conveniently, the heat absorption capacity of the cooling liquid can be guara