Absorption rod of control rod

The invention discloses a control rod absorption rod, which comprises a cladding tube, an upper seal head connected to the upper end part of the cladding tube, a lower seal head connected to the lower end part of the cladding tube, an elastic piece arranged in the cladding tube, and a boron carbide absorber assembly packaged in the cladding tube, wherein one end of the elastic piece is connected with the upper seal head. Compared with the absorption body in the conventional absorption rod adopting a plane contact mode, the absorption rod of the control rod has the advantages that the plurality of sub-absorption bodies are mutually positioned by adopting the convex parts and the groove parts, and the top absorption body and the plurality of sub-absorption bodies can be positioned in the central position in the cladding tube, so that the problem of eccentricity of the absorption body is effectively solved; therefore, enough swelling gaps between the absorbers and the cladding tube are ensured, the swelling life