The invention provides a scanning rack, scanning rack group and scanning apparatus for inspecting welds. The bar type scanning rack for inspecting welds comprises a tensioning buckle component (1), a connecting component, an encoder support (4), a probe fixing mechanism and a tensioning buckle fixing support (10) which are connected from beginning to end in order; after the tensioning buckle component (1) and the tensioning buckle fixing support (10) are fixedly connected, the scanning rack for inspecting welds forms an annular shape. The scanning rack and scanning rack group for inspecting welds are suitable for detecting small-diameter tube row, the scanning apparatus for inspecting welds which contains the scanning rack for inspecting welds or the scanning rack group for inspecting welds is provided with an encoder which is used for recording inspecting positions, so that inspecting efficiency is improved and defect inspecting rate is increased.