A foot pedal folding structure to allow a foot pedal swiveling against a stand of a musical instrument for folding includes a pedal rack, a rack sleeve and a swivel shaft. The swivel shaft includes a circular pin, a first non-circular pin and a second non-circular pin. The pedal rack has a first boss and a second boss which respectively include a first holding aperture and a second holding aperture. The rack sleeve has a rotary boss located between the first boss and second boss. The rotary boss has a rotary hole. The swivel shaft has a latch position in which the second non-circular pin straddles the second holding aperture and rotary hole, and a swivel position in which the swivel shaft fully passes through the rotary hole.