A busbar structure with less stray inductance for a power module includes a radiator, a copper-clad ceramic substrate, a wafer, a plastic case, a positive busbar, a negative busbar and a potting compound. The copper-clad ceramic substrate is welded on the radiator. The wafer is welded on the copper-clad ceramic substrate. The plastic case is fixed on the radiator. The positive and negative busbars are packaged in the plastic case, and fixed on the copper-clad ceramic substrate by ultrasonic bonding. An electrical clearance between wafers as well as an electrical clearance between the positive and negative busbars are ensured by potting. A part of the positive busbar covers a part of the negative busbar. The part of the positive busbar and the part of the negative busbar extend from the inside of the plastic case to the outside of the plastic case.