The control of lifting transmutation of the long-large steel reinforcement cage is one of the momentous technical puzzles for the construction of super-deep T-shape diaphragm walls. Based on the analysis of the existing problems of carrying-lifting method for the lifting of steel reinforcement cage, we propose a new technical principle and technology of external-truss-lifting method for the steel reinforcement cage lifting, which was applied successfully to the construction of super-deep T-shape diaphragm walls for Port Said East Container Terminal-Phase 2 Marine Works in Egypt. The construction effect proves that the existing problems of carrying-lifting method can be well solved, the lifting technology is predigested, the efficiency and security of lifting are improved, the quantity of steel reinforcement for strengthening trusses is decreased, and good economic benefit is gained. It can be applied to the lifting construction for all shape long-large steel reinforcement cages.