The present disclosure disclose a curtain mounting unit which comprises a connecting seat having a receiving cavity formed in a rear end surface, a mounting hole connected with the receiving cavity formed in a front end surface, and a plurality of tenons extending along a longitudinal direction of connecting seat on the outer sides of the connecting seat. The curtain mounting unit has a telescopic tube having external thread arranged outside and a front end to insert into the receiving cavity which comprises an elastic component. The two ends of the elastic component may be abutting against the front end of the telescopic tube and an inner bottom surface of the receiving cavity respectively. The curtain mounting unit has an annularly-shaped locking ring fitted on the outer surface of the telescopic tube.