The invention belongs to the field of payment systems, particularly relates to a parking lot scanned payment system based on an all-in-one machine, and aims to solve the problems that existing main scanning payment excessively depends on network signals, a vehicle owner needs to sign a non-inductive payment protocol in advance for non-inductive payment, and the deduction amount cannot be immediately known. The system comprises an identification module, a transmission module, a fee calculation module, a cache module, a code scanning module, a fee deduction module, a feedback module and a storage module, wherein the identification module is connected with the transmission module and the storage module, the transmission module is connected with the fee calculation module, the fee calculation module is connected with the cache module, the cache module is connected with the code scanning module. According to the invention, the defect that quick payment cannot be realized due to poor network signals of an underground garage can be alleviated, the uncertainty caused by the fact that consumption details of parking cannot be perceived in time by non-inductive payment can be eliminated, the payment time is shortened, the travel time of a vehicle owner is shortened, and carbon emission is reduced.