The invention relates to a parking fee paying system, and particularly relates to a self-disciplined parking fee paying method based on a mobile phone client side and a self-disciplined parking fee paying system thereof. The self-disciplined parking fee paying method is characterized by comprising the steps that (1) each parking place of a parking lot is numbered and the number is marked so that a parking lot parking place arrangement diagram is acquired to be stored in a server and a database is established, wherein the database includes the geographical position of the parking lot, the number of the parking place and the parking place occupation identifier, the parking place occupation identifier includes three states of occupation, free and illegal occupation, and the parking lot parking place arrangement diagram and the parking place occupation identifier are provided for the client side for inquiring. The beneficial effects of the self-disciplined parking fee paying method based on the mobile phone client side and the self-disciplined parking fee paying system thereof are that the parking lot does not require hardware configuration, the parking place situation can be inquired on the mobile phone client side, the parking place can be remotely reserved and payment can be performed through the mobile phone client side and supervised by the third party. The client side can register a private parking place in a self-service way so as to realize parking place sharing; and finally the system of honesty and trustworthiness can be formed in the whole society.