The utility model belongs to the technical field of a petroleum and natural gas borehole operation in-situ process, relates to a method for fixing a spiral ground anchor of a relief line on the ground in the production test field, in particular to a relief line ground anchor fixing device, characterized in that the relief line ground anchor fixing device mainly comprises a stable tripod structure comprising a base, a suspending device and a support and a rotating system consisting of an inverted chain, a hydraulic oil pipe twist and a line spiral ground anchor, the base is fixed on a cathead of a well dredger, one end of the suspending device is fixed with the base, the other end of the suspending device is fixed with the support, the suspending device is supported by the support on the cathead of the well dredger, thus the steady triangle structure is formed, the fixing end of the suspending device and the support extends out outward horizontally to be connected with a hook and a constraint circular ring, a force supplying pipe penetrates through the constraint circular ring vertically to be connected with the upper end of the relief line ground anchor, the inverted chain is hanged on the hook for suspending and adjusting the hydraulic oil pipe twist. The relief line ground anchor fixing device has simple in-situ operation and is labour-saving and time-saving.