Size-adjustable forestry investigation tool for carbon sink forest management

The invention provides a size-adjustable forestry investigation tool for carbon sink forest management, and belongs to the technical field of carbon sink forest management. The tool comprises a base frame assembly, a telescopic assembly, an adjusting assembly and a combined lofting assembly, and can be placed in a plant area to be lofted through a fixed contact pin in the base frame assembly; the telescopic assembly is arranged at the top end of the base frame assembly, and the sizes of the multiple sets of corner connectors can be adjusted in a telescopic mode by manually operating a telescopic hand wheel; a plurality of groups of lofting shafts in the adjusting assembly are arranged on the corresponding corner connectors, and an outer clamping connecting rod and an inner inserting connecting rod can be adjusted according to the telescopic adjustment of the sizes of the corner connectors to form square lofting modules with different sizes; and the inner side of each set of lofting shafts is connected with th