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A high-performance lamp-pumped rubidium atomic frequency standard (RAFS) prototype is developed. In the physics package of the RAFS, a rubidium spectral lamp with Xe as the starting gas and the isotope filtering technique are used to depress the optical shot noise of atomic signal. 30 mm-diameter absorption and filter cells located in a slotted-tube microwave cavity are utilized to increase the amplitude of clock transition signal. For the electronic system, a new low phase noise microwave chain is developed. The frequency stability measurement of the prototype shows a short-term frequency stability of 2.1×10-13τ-1/2 within 1s~100s. This is the best short-term stability result for rubidium clock obtained so far, suggesting that the stability of the traditional RAFS could be comparable to that of the laser-pumped RAFS.