A plug connector includes an insulating body, two power terminals arranged on the insulating body, and a cable having at least two power wires. A mating portion is provided at a front end of the insulating body. The mating portion is recessed with a mating slot from front to back. The mating slot has a first width in a left-right direction. Each power terminal has at least one contacting portion protruding and extending into the mating slot. The two power terminals are conducted and are provided with a second soldering portion. The second soldering portion has a second width in the left-right direction, which is greater than one third of the first width. The at least two power wires are connected to the second soldering portion.