A musical instrument stand has a base frame having a joint connected to three leg rods and a main pipe, a main tube engaging with the main pipe, a socket disposed on the main pipe, a connector disposed on a top end of the main tube, a bracket support device engaging with the socket, and a fixed brace device engaging with the connector. A fastening bolt fastens the main pipe and the main tube. The connector has a lower tube and a transverse pipe connected to the lower tube. The transverse pipe has an enlarged opening, an L-shaped end notch communicating with the enlarged opening, a through hole communicating with the enlarged opening, an inner recess formed in an inner wall of the transverse pipe, and an inner chamber communicating with the inner recess and the through hole.