The invention relates to a rectangular coordinate mechanical arm control system. The rectangular coordinate mechanical arm control system comprises an Arduino master machine. The Arduino master machine is connected with a wireless router, a steering engine, a left mechanical arm control module and an Arduino slave machine. The Arduino slave machine is connected with a right mechanical arm control module. The wireless router is connected with a client side and a pan tilt provided with a main camera. The pan-tilt is connected with the steering engine. The left mechanical arm control module and the right mechanical arm control module are used for controlling a left mechanical arm and a right mechanical arm respectively. The main camera is used for collecting information of the left mechanical arm and the right mechanical arm and transmitting the information to the client side through the wireless router. The client side remotely controls the left mechanical arm and the right mechanical arm according to the received information. By means of the rectangular coordinate mechanical arm control system, the mechanical arms can be remotely monitored and operated at the client side.