日本投降后，北洋大学迅即复校。同期，教育部令北洋大学接收敌伪时期在原北平大学工学院校址上建立的所谓“北京大学工学院”。北洋大学接收后，改为“北洋大学北平部”，但停办纺织系。在原北平大学机织系教授张朵山等人建议下，北洋大学向教育部提出在天津“恢复本校北平部原有纺织系”，并获得批准。此后，原北平大学工学院机织系的主要专业教师和图书资料，最终随系一起落户津门。“至此，我国北方历史最悠久之纺织工程学系”最终在北洋大学复系，名至实归。
1951年，北洋大学与河北工学院合并成立天津大学，两校纺织系合并成立天津大学纺织系。
教育部批准在北洋大学恢复原北平大学工学院纺织系的批文
为恢复纺织系上呈教育部的申请（部分）
教育部令北洋大学接收日伪时期成立的“北京大学”工学院（北平临时大学第五分班）电函
1958年8月13日，毛主席在办公楼前接见师生
毛主席观看细纱机
校友陈哲娥（左二）向周总理汇报工作成果
1954年，原天津纺织工业学校师生喜迎新年，右一梅自强院士
师生们在天津大学南院
纺织系女生参加庆祝“五一”游行大会仪仗队
纺织传统的象征—天津大学纺织系锯齿形屋顶的实习厂
1988年北洋大学校友在天津纺织工学院聚会
Peiyang University resumed its classes as soon as Japan surrendered in 1945. Meanwhile, the Ministry of Education ordered Peiyang University to take in the so-called “Polytechnic School of Peking University”, which was established on the original site of the Polytechnic School of Peking University during the Japanese occupation. Later, it was renamed as “Peking School of Peiyang University”, but Textile Department was still closed down. Suggested by Zhang Duoshan, professor at the former Department of Weaving of Peking University, and some other people, Peiyang University applied to the Ministry of Education for “restoring the original Textile Department at Peking School of the Peiyang University” in Tianjin, which was then approved. Subsequently, most of the staff memberts of the former Department of Weaving, the Polytechnic School of Peking University came back to Tianjin along with its books and reference materials. “By then, the oldest department of textile engineering in North China” finally settled in Peiyang University.
In 1951, Peiyang University was combined with Hebei University of Technology into Tianjin University, and their textile departments were also combined into Textile Department of Tianjin University.