Portable forest tending and pruning brush cutter

The invention discloses a portable forest tending and pruning brush cutter. The portable forest tending and pruning brush cutter comprises a circular saw blade, a saw head, an intermediate transmission rod, a miniature gasoline engine and a handle, wherein a saw head input shaft in the saw head is connected with one end of a transmission shaft in the intermediate transmission rod through a concave and convex type joint; the other end of the transmission shaft in the intermediate transmission rod is also connected with an output shaft of the miniature gasoline engine through the concave and convex type joint; the concave and convex type joint mainly comprises a convex spindle head, a concave spindle head and a sleeve; the convex spindle head is matched with the concave spindle head; one end of the convex spindle head and the saw head input shaft are fixedly connected with each other or are integrally formed in a cutting manner; and two ends of the sleeve are respectively in threaded connection with the saw head and the intermediate transmission rod. The portable forest tending and pruning brush cutter is simple in structure, high in functionality and convenient to carry, and is economical and practical; the length of the body can be increased or decreased at any time according to heights of branches; and requirements on tending and pruning heights of woods at different ages are met.