The invention discloses a port binding method and a port binding device. The port binding method comprises an A step of determining a port type of a current test channel; a B step of determining a test mode of the current test channel according to the information of a product to be tested of the current test channel; a C step of judging whether a port of the current test channel is bound with a port number; and a D step of binding a port number for the port of the current test channel according to the port type, the test mode and a preset binding mode if the port of the current test channel is not bound with a port number. According to the invention, the method and the device solve the problem of manually configuring the test channel port number, save the test time, reduce the occurrence of test exceptions and realize the automatic binding of the port number and the port of the test channel.