Power adapter with optional types of replaceable plug

A power adapter with a replaceable plug comprising a universal body, and a replaceable plug which can be replaced by plugs with various specifications to assemble with the universal body,

• wherein the universal body, having a bottom surface with a circular convex edge surrounded by at least two block holes and a recess surface located at the inner lower part of the circular convex edge to form a recess slot between the recess surface and the circular convex edge, the universal body further comprising:
• two symmetry openings at the inner surface to allow conductive surface ends of the universal body to convex out,
• wherein a switch opening holds a control panel of a switch key which is fixed at an outer edge of an error-proof block hole with a fan-shaped block at a front end of the switch key and an elastic piece fixed at a back end,
• wherein the replaceable plug of the switch key including a circular recess surface which has blocks opposite to block holes, and one of several blocks is arranged as a slot, wherein the circular recess surface has two convex conductive plates which are located opposite to the conductive surface ends of the two symmetry openings so that the conductive plates can connect with the conductive surface ends,
• wherein plug prongs located on a bottom of the plug are configured to connect with the conductive surface ends respectively,
• wherein, when the plug is rotated, the fan-shaped block is configured to move to the position of the block slot and spring into the block slot to thereby lock firmly to prevent the plug from reverse movement while simultaneously, the two conductive plates of the plug move to contact with the conductive surface ends of conductive plate of the universal body to transmit electricity.