The invention relates to the technical field of financial machines, and provides a thickness abnormity detecting method and device of paper money, a terminal device and a computer storage medium. Thethickness abnormity detecting method comprises the following steps: in a money detecting process of the paper money to be detected, detecting a rotation speed of a money dividing wheel in real time; if the difference between the detected rotation speed and a preset standard rotation speed is greater than a first threshold value, judging the thickness of the paper money to be detected is abnormal,wherein the standard rotation speed is the rotation speed of the money dividing wheel detected in the money detecting process of the standard paper money. The above process is capable of, through using a corresponding relation between the rotation speed of the money dividing wheel and the thickness of the paper money, detecting the rotation speed of the money dividing wheel in real time in the money detecting process of the paper money to be detected, if the difference between the detected rotation speed and the standard rotation speed is greater than the first threshold value, indicating thelarger difference exists between the thickness of the paper money to be detected and the thickness of the standard paper money, namely the thickness of the paper money to be detected is abnormal. Theprovided detecting method can be used for effectively improving the reliability of the thickness abnormity detection of the paper money.