The invention discloses a shopping trolley, a shopping system and an implement method of the shopping system. The shopping trolley comprises a shopping trolley body. The shopping trolley body is provided with a display device, a bar code scanning device, a control device, a first storage box and a storage device. The unit price of each commodity selected and placed in the first storage box of the shopping trolley body by a user and the total price of all commodities can be stored in the storage device, when the user checks out, a cashier can print a complete receipt by obtaining data in the storage device, jamming caused when the user checks out is avoided, cost for hiring cashiers is lowered, cash registering efficiency is increased, the quality of service is improved, and therefore customers can feel comfortable in shopping.