Dust shielding device for building construction

The invention relates to a dust shielding device, in particular to a dust shielding device for building construction. The invention provides a dust shielding device for building construction. The dust shielding device for building construction can fully shield dust and can prevent workers from carrying dust when entering and exiting, and the dust shielding device for building construction comprises a bottom frame, a drainage pipe, a valve and the like. Four air holes are formed in the upper portion of the bottom frame, the lower portion of the bottom frame is communicated with a drainage pipe, and a valve is installed on the drainage pipe. When an external worker prepares to enter a rest area of a building, the external worker makes contact with the outer side air curtain wall firstly, then the worker blocks flowing of outer side air, a part of gaps exist in the outer side air curtain wall, dust penetrates through the outer side air curtain wall to enter a door frame, and due to the fact that the inner side a