The invention relates to a star-shaped foundation. The star-shaped foundation comprises a star-shaped component embedded into the ground, a plurality of beard and hair anchor rod bodies, base plates and anchor plates, wherein the base plates and the anchor plates are matched with the beard and hair anchor rod bodies. The star-shaped component is provided with a plurality of extended arms extending out in the radial direction, and an anchor rod hole I is formed in the center of the star-shaped component. The outer end of each extended arm is provided with an anchor rod hole II. An anchor rod hole III is formed in the center of each base plate. The bottom ends of the multiple beard and hair anchor rod bodies are all anchored, and the top ends of the beard and hair anchor rod bodies penetrate through the anchor rod hole I and the anchor rod holes II of the star-shaped component and further penetrate through the anchor rod holes III of the base plates to be connected with the corresponding anchor plates together. The beard and hair anchor rod bodies are composed of tension thin wires. Water-resistant explosives filled with detonators are bundled on the lower portions of the corresponding tension thin wires, and the tension thin wires are evenly distributed on the peripheries of the water-resistant explosives filled with the detonators in the perimeter direction. The invention further discloses a construction method of the star-shaped foundation. According to the star-shaped foundation and the construction method thereof, the structure is simple, the foundation form and construction mode are changed fundamentally, investment is reduced obviously and waste soil is also reduced.