The invention relates to a novel steel bar metallic yielding damper. The novel steel bar metallic yielding damper comprises an inner box (1), an outer box (2) and a steel bar (3). The inner box (1) and the outer box (2) are fixedly connected with a structural support through high-strength bolts. The inner box (1) and the outer box (2) are hinged to the steel bar (3) through high-strength bolts andare rigid. The steel bar (3) adopts equicohesive cross section design. When an earthquake occurs, a frame structure generates layer displacement, a support component is axially tensioned, the steel bar (3) deforms, and then metallic yielding energy consumption is achieved. Accordingly, the equicohesive cross section design is adopted, total cross-section yielding is achieved, and the yielding energy-consumption capacity of materials are fully utilized; applied steel is less, and the steel bar is easy to replace after being damaged; different damping forces and deformation capacity can be obtained by adding different numbers of steel bars; the novel steel bar metallic yielding damper has the advantages of being simple in factory production, convenient to install, low in maintenance cost and the like, and has high practical value and economic benefit.