3D printing equipment

The utility model discloses 3D printing equipment which comprises a base plate and a printing module, the printing module is arranged on the base plate, and the printing module comprises a powder laying part used for moving along the surface of the base plate and laying powder on the base plate in a layered mode; the laser part is used for carrying out laser sintering on the powder laid on the substrate in layers to obtain a printing workpiece; the air cooling part is provided with an air inlet, a ventilation pipeline and an air outlet which are sequentially communicated, and the air inlet and the air outlet are symmetrically formed in the two sides of the powder spreading part in the moving direction; an exhaust fan and a cooling assembly are arranged on the ventilation pipeline, and the cooling assembly is used for reducing the temperature of the protective gas in the ventilation pipeline. According to the 3D printing equipment provided by the invention, the temperature of the protective gas of the printing