The invention relates to a self-service car washer. The self-service car washer comprises a machine body device used for supporting, an intelligent water control device used for conducting car washing, and a control device used for switching of car washing functions, wherein the machine body device comprises a case body, a supporting frame and a bearing cross beam are arranged inside the case body, a one-way openable door is further arranged on the case body, a panel window is arranged on the one-way openable door, the intelligent water control device comprises a filter, a water tank and a washing fluid tank, the filter, the water tank and the washing fluid tank are connected through guide pipes, a pressure sensor A and a pressure sensor B are arranged on the bottom of the water tank and on the bottom of the washing fluid tank and are connected through a control valve A and a control valve B, the control device comprises a panel body, a water outlet control key, a bubble outlet control key, a magnetic card sensing area and a coin slot are arranged on the panel body, and then diversified consumption of customers is facilitated. The self-service car washer has the advantages of being simple in structure, convenient to use and complete in function.