A rod holder for musical instrument used for adjusting relative angles of two musical instrument rods, comprising two clamp sets clamping the two musical instrument rods and a connecting ring, respectively. Each clamp set comprises a fixed clamping block, a movable clamping block, a locking member and a cylindrical portion. One surface of the fixed clamping block and one surface of the movable clamping block which correspond to each other are respectively recessed inwardly and face to each other to form a clamping groove, and one side of the cylindrical portion opposite to the clamping groove is disposed with a circular disk. The connecting ring comprises two approximately circular grooves, and the two circular disks are respectively disposed in the two approximately circular grooves. The two circular disks rotate in the two approximately circular grooves to allow the two clamp sets capable of rotating relative to the connecting ring.