Curtain wall with hidden-frame inward-opening window

The invention discloses a curtain wall with a hidden-frame inward-opening window, and relates to the technical field of building engineering. The curtain wall comprises upright columns, cross beams, window frames and auxiliary glass frames, wherein the upright columns and the cross beams are correspondingly positioned on the rear surfaces of the auxiliary glass frames; the window frames are arranged opposite to the auxiliary glass frames, and water separating chambers which are insulated from the outside are formed between the window frames and the auxiliary glass frames; the water separating chambers are divided into inner chambers and outer chambers; horizontal first draining channels are arranged on the cross beams; longitudinal second draining channels which are in parallel to the upright columns are arranged between the auxiliary glass frames. According to the curtain wall, two water separating chambers are formed, and each water separating chamber is individually provided with the corresponding draining channel; in addition, the outer chamber draining channels are of damping draining structures through which water running pipelines can change the directions twice to decrease the air pressure in the curtain wall on the premise that the water can be smoothly drained, and thus the rainwater backflow can be reduced.