The utility model provides an SF6 gas positive pressure leak gas supply device. The device comprises a filter, a gas source valve, a first-level pressure-adjusting valve, a second-level pressure-adjusting valve and a leak gas supply ball valve. The filter, the gas source valve, the first-level pressure-adjusting valve and the second-level pressure-adjusting valve are sequentially connected to form a series branch; a gas source pressure gauge is arranged between the filter and the gas source valve; and a first-level pressure-adjusting pressure gauge is arranged between the first-level pressure-adjusting valve and the second-level pressure-adjusting valve. The improvement lies in that the leak gas supply valve is serially connected with the filter to form a leak gas supply valve-filter series branch; the leak gas supply valve-filter series branch and an exhaust valve are connected in parallel and then connected with the second-level pressure-adjusting valve in the filter-the gas source valve-the first-level pressure-adjusting valve-the second-level pressure-adjusting valve series branch. Compared with the prior art, the SF6 gas positive pressure leak gas supply device can provide leak indication gas for multiple paths of leaks with different leak rates, the test efficiency is improved, field operation is facilitated, and the problem of sensitivity calibration of SF6 gas leakage imager can be solved.