The present invention discloses a modularized circuit for isolated circuit, wherein the isolated circuit includes at least two circuit components connecting in parallel and/or series, the circuit components, according to a circuit connection configuration, weld corresponding pins of the components directly, forming an integrated module in accordance with a desired connection method of the circuit, and saving circuit boards and wires; the circuit components are designed as a parallelepiped, and a plurality of bonding pads are arranged on part of an area on a surface of the parallelepiped. Due to constructing a circuit unit by welding connections in a way of building blocks, welding directly between components in a 3D space, comparing to the circuits limited in a circuit board plane as a PCB, it owns a wider design space.