The invention discloses a method for detecting sealing quality of an oil pipe at a well head. The method comprises the steps of placing a packer to the thread connection part in the oil pipe by a lifting device, setting the packer by a high-speed booster pump and adding a detection medium in a sealed space, detecting the leakage value of the detection medium by the detection device, and inputting and recording a detection result by a recording device. By the method, the oil pipe can be detected at the well head, the result can serve as a basis for judging whether the sealing quality of the oil pipe in rigid connection is qualified or not and therefore the sealing quality of the oil pipe is improved greatly.