The invention discloses an expansion type loop resistance test wire clamp for a handcart high-voltage circuit breaker, and relates to the technical field of test appliances in the power industry. Theexpansion type loop resistance test wire clamp is characterized in that: a test clamping arm B is hinged to a test clamping arm A through a shaft pin A; one end of the test clamping arm B is hinged toa test head rotating piece A through a shaft pin B; the test head rotating piece A is fixedly connected with a voltage electrode test head; the other end of the test clamping arm B is sleeved with avoltage handle; a voltage wire runs through a cavity of the test clamping arm B and is connected with the voltage electrode test head; one end of the test clamping arm A is hinged to a test head rotating piece B through the shaft pin B; the test head rotating piece B is fixedly connected with a current electrode test head; the other end of the test clamping arm A is sleeved with a current handle;and a current wire runs through a cavity of the test clamping arm A and is connected with the current electrode test head. The beneficial effects of the wire clamp are that the wire clamp guarantees close contact between a test electrode and a contact finger, is flexible and convenient to operate, improves efficiency and reliability of loop resistance testing, and improves work efficiency of a tester.