The invention discloses a rotary button lock. The rotary button lock comprises a lock bracket, a driving piece, a swing arm, a sliding block, a support and a pressing head, wherein the driving piece,the swing arm, the sliding block, the support and the pressing head are arranged on the lock bracket, a driving
insertion hole is formed in one side of the lock bracket, a sliding groove is formed inthe other side of the lock bracket, the driving piece is sleeved with the driving
insertion hole, the sliding block is installed in the sliding groove, one end of the swing arm is connected with the driving piece, the other one end of the swing arm is connected with one end of the sliding block, the support is in a bent shape, one end of the support is hinged to the lock bracket, guide grooves areformed in the middle of the support, the other end of the support is connected with the pressing head, a shifting pin is arranged at the other end of the sliding block, the end part of the shifting pin extends into the guide groove, the driving piece comprises a shaft shell and an ejector rod, the shaft shell is sleeved with the driving
insertion hole, a through groove is formed in the shaft shell, and a limiting clamping block is arranged on the ejector rod. The rotary button lock is simple in structure, small in size, light in weight, convenient to install and rapid and reliable in unlocking and locking operation, no protruding structure exists on the surface of a covering cap after installation, and the better aerodynamic configuration of an aircraft is guaranteed.