Modularized distribution box

The utility model relates to the distribution box field, and specifically discloses a modularized distribution box comprising a side wall assembly and a sealing cover assembly, the side wall assembly comprises a door plate, a first side plate, a second side plate and a third side plate which are hinged in sequence, the door plate is detachably connected with the third side plate, and the peripheral edge of the sealing cover assembly is provided with steps, grooves and fastening screws thereof. The side wall assemblies surround to form an annular rectangular structure, and the sealing cover assemblies are located on the upper and lower sides of the side wall assemblies. The side wall assemblies and the sealing cover assemblies are in modular design, the side wall assemblies can be machined into different height specifications in advance, the side wall assemblies of various specifications can be combined into distribution boxes of different spaces, or the capacity of the distribution box is further expanded, an