Abstract: Disclosed in the present invention are a method and a device for foreign exchange purchase transactions, said method comprising: predicting, according to historical transaction data, a predicted total foreign exchange purchase amount within a first set deadline; within an exchange rate stabilization period of the first set deadline, initiating a foreign exchange purchase transaction request according to the predicted total foreign exchange purchase amount, the foreign exchange purchase transaction request being used for purchasing, according to the exchange rate within the exchange rate stabilization period, foreign exchange of the predicted total foreign exchange purchase amount; after the first predetermined deadline expires, acquiring an actual total foreign exchange purchase amount within the first predetermined deadline; and performing transaction clearing according to the actual total foreign exchange purchase amount and the predicted total foreign exchange purchase amount.