Curtain wall with inner drainage groove

The utility model relates to a curtain wall with an inner drainage groove, which comprises an upper unit curtain wall and a lower unit curtain wall, wherein a lower cross beam is arranged at the lower part of the upper unit curtain wall, an upper cross beam is arranged at the upper part of the lower unit curtain wall, the outer sides of the upper cross beam and the lower cross beam are stuck with glass with viscose glue, the lower cross beam is inserted into the upper cross beam so that the upper unit curtain wall and the lower unit curtain wall are connected together, and the inner drainage groove is arranged in the upper cross beam. For the curtain wall with the inner drainage groove, the inner drainage groove is arranged in the upper cross beam, so that when rainwater enters the space formed by the upper cross beam and the lower cross beam through wind pressure, the rainwater can be drained in standing columns of the curtain walls through the inner drainage groove and then can be drained to the ground surf