The invention discloses a music score switching triggering device that comprises: a command receiving unit, a command generating unit, a monitoring unit and a signal generating unit which are successively connected. The monitoring unit is further connected with a triggering unit. The command receiving unit receives a switching instruction. The command generating unit then generates a switching condition instruction. Further, when receiving a trigger signal and determining that an instrument starts playing, the triggering unit triggers the monitoring unit to monitor a playing environment, and triggers, when the monitored environment satisfies the switching condition instruction, the signal generating unit to issues a switching signal to switch the music scores. The device avoids manual switching intervention and realizes automatic switching triggering of the music scores, thereby avoiding an influence on a performer and ensuring performance continuity and switching punctuality.