Variable frequency air conditioner debugging instrument

The invention provides a variable frequency air conditioner debugging instrument comprising a detecting circuit (10) and a central processing unit (30), wherein the detecting circuit (10) is connected on a transmission line between an air conditioner indoor set and an air conditioner outdoor unit and is used for obtaining state signals of the air conditioner indoor set or the air conditioner outdoor unit; and the central processing unit (30) is connected with the detecting circuit (10) and is used for obtaining the states of the air conditioner indoor set and the air conditioner outdoor unit according to the state signals. The technical scheme provided by the invention can used for monitoring information transmitted by communication of a null line and a live wire without affecting the work of an air conditioner, and a detector can comprehensively master the operation state of the air conditioner according to detecting data obtained by the detecting circuit even if the onsite equipment allocation is incomplete.