The invention discloses an airplane control plane deflection angle measuring system, and belongs to the technical field of engineering observation and control. The airplane control plane deflection angle measuring system is characterized by comprising an operation control unit [1], a horizontal stabilizer deflection angle measuring unit [2], an elevator deflection angle measuring unit [3], an aileron deflection angle measuring unit [4], a rudder deflection angle measuring unit [5], a spoiler deflection angle measuring unit [6], a flap deflection angle measuring unit [7], a slat deflection angle measuring unit [8], a field control bus [9], an operation application unit [10], a field power supply [11] and a field power line [12], wherein the operation control unit [1] executes the order of the operation application unit [10], and realizes transmission of control orders, state information and measurement data with the deflection angle measuring units through the field control bus [9]; the field power supply [11] supplies power to the various deflection angle measuring units through the power line [12]. The airplane control plane deflection angle measuring system disclosed by the invention is complete in functions, reasonable and compact in structure, reliable in working, convenient to use, and good in expandability and clipping modularity.