Ventilation device for building construction

The utility model belongs to the technical field of building construction, and particularly relates to a ventilation device for building construction, which comprises a base, a lifting cylinder is fixedly connected above the base, a telescopic rod is connected above the lifting cylinder, a first connecting block is fixedly connected above the telescopic rod, and a fixing hoop is arranged above the first connecting block. An air duct is fixedly connected to the interior of the fixing hoop, an air inlet fan is arranged at one end of the air duct, fan blades are arranged in the air inlet fan, an air inlet is formed in one side of the air inlet fan, and an air outlet is formed in the other end of the air duct; a purification tank is arranged on one side of the interior of the air duct, a primary filter screen is arranged on one side of the interior of the purification tank, and an electrostatic adsorption screen is arranged on one side of the primary filter screen; the building construction site ventilation syste