A protection plate for a tree-lined street is provided to offer easy openness and closeness of the protection plate in case planting space is expanded and to offer easy installation of the plate. A protection plate for a tree-lined street includes an outer frame(20), a plurality of lock frame fastening protrusion parts(6), a plurality of latch groove part(10), a protection board(30), and a planting trees space part(31). The outer frame includes a settling surface(12). A locking protrusion and a locking groove are formed in both sides of the lock frame fastening protrusion parts. The protection board comprises a left side plate(30A) and a right side plate(30B). A latch(9) is combined with latch groove parts.
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