The invention relates to a high-precision overloading-protecting automobile super-unbalanced overloading detector which comprises an automobile body connecting plate (A), a stay wire displacement sensor (B), a connecting steel wire (C), an overloading protection mechanism assembly (D), a rear axle steel plate spring connecting plate (E) and a mechanism fastening device (F), wherein the overloading protection mechanism assembly (D) is connected with the stay wire displacement sensor (B) through the connecting steel wire (C), the stay wire displacement sensor (B) is connected to the automobile body connecting plate (A) through a bolt (1) and connected with side beams at two sides of an automobile frame through the automobile body connecting plate (A), the overloading protection mechanism assembly (D) is connected with the rear axle steel plate spring connecting plate (E) through the mechanism fastening device (F), and the rear axle steel plate spring connecting plate (E) is connected tosteel plate springs at two sides of the rear axle. The high-precision overloading-protecting automobile super-unbalanced overloading detector has the advantages of test accuracy and high precision and can judge the super-unbalanced overloading state of automobiles; and the detector is also provided with an overloading protector, has low cost, is easy to popularize, and ensures safe running of theautomobiles.