The utility model relates to a high-voltage 10kV portable direct tester for electric power conforming to the power consumption principle of an oil pumping unit. The tester comprises a test host which is connected with each phase line of a three-phase power line at a load end through a photoelectric isolator; each phase line of the three-phase power line is also provided with a current detection device; and the current detection devices are connected with the test host respectively. After high-voltage power is cut, a current transformer is sleeved on a high-voltage line, and a voltage clip is connected to the high-voltage line; and after the current transformer and the voltage clip are connected well, the high-voltage line transmits electricity, and an operator starts operating the instrument to perform electric power test. After the test is over, the power of the high-voltage line is cut, and the current transformer and voltage clip are removed. The tester provided by the utility model has high measurement precision and is safe and reliable.