The invention provides a modular power supply control box. The modular power supply control box comprises a box body, an installation frame, a plurality of component installation modules and a plurality of wire modules, the installation frame is divided into a plurality of installation intervals, each installation interval is provided with a threaded hole group, one side of the installation frameis provided with a pair of fixed threaded holes, a side edge of the installation frame is at least provided with a pair of limiting teeth, the installation frame is arranged in the box body through aconnecting mechanism, the component installation modules are fixed on the front surface of the installation frame through the threaded hole group, the wire modules are arranged on the backside of theinstallation frame, and a protruding edge is arranged in the box body. The modular power supply control box is advantageous in that the installation frame capable of moving and overturning is providedso that the installation of components is convenient; the modular power supply control box is divided into multiple module assembling circuits so that the installation is flexible; and the wire modules are adopted for connection of the components so that the connection is simple.