The present invention relates to a method and a system for providing a real estate transaction service and, more particularly, to a method for providing a real estate transaction service by an escrow server in a real estate transaction service system comprising an escrow server, a bank server, and a transaction server, the method comprising : a step of checking authentication of parties involved in a first transaction contract, upon receiving first transaction contract information from the transaction server, and generating first transaction management integration data; a step of converting transaction money transferred from the buyer of the first transaction contract into virtual money; a step of checking authentication of parties involved in a second transaction contract, upon receiving second transaction contract information including at least one of parties involved in the first transaction contract from the transaction server, and generating second transaction management integration data; a step of updating details of payment of the first transaction management integration data and details of money transfer of the second transaction management integration data, when the seller of the first transaction contract requests payment of the virtual money; and a final payment step of transmitting a command to the bank server such that the entire amount of transferred money registered in the second transaction management integration data is paid in cash to the seller of the second transaction contract upon receiving a signal, from the transaction server, indicating that the procedure of real estate-related registration regarding the first transaction contract and the second transaction contract is completed.