The invention discloses a single-phase fluid tube-plate heat absorber loop. Each tube plate is composed of a lower header (1), an upper header (2) and heat absorbing tubes (3). The tops of the heat absorbing tubes (3) communicate with the upper header (2), and the bottoms of the heat absorbing tubes (3) communicate with the lower header (1). The plurality of heat absorbing tubes (3) are arranged in parallel on the same plane and are located in the middles of the tube plates. The heat absorber loop is formed by parallel arrangement of the plurality of tube plates, and connecting pipelines (5) with second check valves (4') and common connecting pipelines (6) are used for communicating the adjacent tube plates and are mounted between the lower headers (1) and between the upper headers (2) of the adjacent tube plates. Valves (7) are mounted on a main inflow pipeline (8), a main outflow pipeline (9) and auxiliary pipelines (10) which are connected with the heat absorber loop.