Retaining wall assembly block with replaceable decorative surface layer

The utility model discloses a retaining wall assembly block with a replaceable decorative surface layer, and relates to the technical field of retaining walls, the retaining wall assembly block comprises a main block, two groups of positioning units I are arranged on the top surface of the main block, the two groups of positioning units I are symmetrically arranged on the main block, two groups of positioning units II are arranged on the bottom surface of the main block, and the two groups of positioning units II are symmetrically arranged on the main block. When a plurality of main blocks are piled up, the positioning units I can be matched with the corresponding positioning units II for positioning; clamping grooves are formed in the two parallel side faces of the main block respectively, edge closing clamping pieces can be clamped in the clamping grooves, hanging parts are arranged on the sides, away from the clamping blocks, of the edge closing clamping pieces, hanging parts are arranged on the two side f