The invention discloses a terminal remote assistance method, device and system. The method comprises the steps that a business server transmits the current operation state of a first terminal to a second terminal, wherein the current operation state is the operation state of a local application of the first terminal requiring assistance operation of the second terminal; the business server receives an assistance operation instruction corresponding to the current operation state transmitted by the second terminal; the business server performs assistance operation on the current operation state according to the assistance operation instruction so that an assistance operation result is obtained; and the business server transmits the assistance operation result to the first terminal. The technical problems of high burden caused by the fact that terminal equipment requires to consume its own operation resource to realize final remote assistance can be solved.