The utility model discloses a novel mouthful test phones of plugging into more, its test phone passes through the bus out to be connected with the terminal box, be provided with at least two branch signal line in the terminal box, each the outer end of branch's signal line is connected with the one measuring head respectively, be provided with one knob style switch in the terminal box, the input line of the knob style switch with a looks line connection of bus out, the output line of the knob style switch respectively with all a phase line of branch's signal line is corresponding, another phase line of bus out respectively with all another looks line connection of branch's signal line, each set up the one pilot lamp on branch's signal line respectively. The utility model discloses a break -make of each signal line of knob style on -off control avoids out adjacent existing signal line each other to bump the short circuit and influences the test effectiveness who plugs into in addition mouthful, has realized that a test phone can satisfy the test on the VDF (voice distribution frame) of multiple producer or model.