The utility model discloses a hydraulic fracturing ground stress test system of a panoramic borehole observation instrument. The hydraulic fracturing ground stress test system comprises a high-pressure pipe, a pressure sensor, an energy accumulator, a high-pressure oil pump and a data acquisition instrument, wherein one end of the high-pressure pipe is provided with a water injection hole, the upper end of the water injection hole is provided with packers, the high-pressure pipe is connected with the energy accumulator and the pressure sensor, the energy accumulator is connected with the high-pressure oil pump, the connective position between the energy accumulator and the high-pressure oil pump is provided with a flow meter, and the pressure sensor is connected with the data acquisition instrument. The rubber packers are sent to appropriate borehole positions by a high-rigidity water injection pipe in a borehole drilled previously, and then high-pressure water is injected through the high-pressure oil pump and the energy accumulator; a high-pressure water is injected to the rock hole between the packers until the surrounding rocks are fractured, and then the high-pressure oil pump is shut down and cracks are closed; and data are acquired by the data acquisition instrument, the maximum horizontal principal stress and the minimum horizontal principal stress can be obtained by analysis and calculation, and the maximum horizontal principal stress direction is the fracture direction.