Based on the GEM model, an evaluation index system for the competitiveness of high-quality development of Tianjin's manufacturing industry is established. The AHP entropy weight method is used to calculate the comprehensive score of Tianjin's manufacturing industry competitiveness from 2005 to 2020, and the barrier degree model is used to measure the barrier degree of the evaluation index. The results show that the competitiveness of Tianjin's manufacturing industry is on the rise, but the speed of improvement is slowing down.Tianjin's manufacturing industry is undergoing structural adjustment while pursuing scale expansion, but its opening level has not yet reached the requirements of high-quality development.The imbalance of industrial structure, lack of innovation power and low efficiency of foreign trade are the main problems . On this basis, countermeasures and suggestions are put forward from the dimensions of economy, environment and society.