The utility model discloses a deep foundation pit construction faces frontier defense and protects portable regularization railing forms by splicing about at least two railing units, and every railing unit all includes the fixed universal wheel of support frame and support frame bottom of protection network piece, fixed protection network piece, the protection network piece includes that at least two stride wire net in the inboard rectangle inside casing skeleton of every frame skeleton, fixed connection in every inside casing skeleton front side of a shape frame skeleton, fixed connection, fixed connection and violently carry on the back the sign baseboard between stupefied and the base that corresponds the inside casing skeleton in the stupefied and fixed connection of violently carrying on the back of every inside casing skeleton lower part in every. The utility model discloses to deep basal pit earthwork excavation, especially face the quick formation that frontier defense was protected among the multilayer earthwork excavation process, what provide a safety, reliable, economy and environmental protection faces the frontier defense guardrail.