The invention provides a crank call number classification method, a crank call number classification device and a crank call number classification system, belongs to the technical field of communication, and can solve the problem that existing operator platforms cannot classify crank call numbers. The crank call number classification method provided by the invention comprises the steps of generating a communication index of each phone number according to an acquired voice detailed list of each phone number; judging whether the phone number is the crank call number according to the communication index; when the condition that the phone number is the crank call number is determined, combining the crank call numbers according to the communication index corresponding to each crank number and generates a call set, thus allowing the operator platform to classify the crank call number according to the call set.