The embodiment of the invention provides a control conversion device and a 
control system. When a mode conversion mechanism receives a first 
signal of a solenoid control valve, the mode conversion mechanism is in an 
electric control state; when a 
clutch mechanism receives a second 
signal of the solenoid control valve, there is a first space between the 
clutch mechanism and a mechanical control mechanism, and the first space guarantees that mechanical motion of the mechanical control mechanism does not cause linkage of the 
clutch mechanism; when the mode conversion mechanism does not receive the first 
signal of the solenoid control valve, the mode conversion mechanism is in a mechanical control state; and when the clutch mechanism does not receive the second signal of the solenoid control valve, the clutch mechanism sticks to the mechanical control mechanism, and the mechanical motion of the mechanical control mechanism causes linkage of the clutch mechanism. After 
electric control fails to work, the working state of the mode conversion mechanism is converted, and the clutch mechanism is enabled to stick to the mechanical control mechanism; and therefore, control surface control isconverted from 
electric control to mechanical control, and the safety of an aircraft is enhanced.