Abstract: Carbon materials are considered as the promising potassium ion battery anode materials owing to their abundant sources and easy preparation. Herein, boron-doped porous carbon (B-pC) was constructed by using glucose, sodium tetraborate, and sodium chloride as the carbon precursor, the boron source, and the hard template, respectively. The obtained B-pC is assembled with ultrathin porous carbon nanosheets, further constructing a three-dimensional network structure with a large specific surface area (577.8 m²/g) and pore volume (0.66 cm³/g). When used as an anode material for potassium ion battery, the B-pC anode shows long-cycle stability as well as excellent rate performance. The reversible capacity maintains 246 mAh/g after 100 cycles at a current density of 0.1 A/g, showing a capacity retention ratio of 90.5% when compared with the 2nd discharge capacity. Furthermore, the reversible capacity recovers 98.4% when the current density turns back to 0.1 A/g, which exhibiting a promising application on potassium ion batteries.