Modularized track-type power distribution bus unit

The invention provides a modular track-type power distribution bus unit, and the power distribution bus unit comprises a track-type bus trunk body, a power distribution module, a power supply module and a vacancy protection housing. The power supply module, the power distribution module and the vacancy protection housing are locked and clamped on the bus trunk body, and spacing bars are clamped among the power supply module, the power distribution module and the vacancy protection housing. According to the invention, the power distribution module is locked and fixed at any position of a bus housing through the cooperation of a pressing buckle on the lower housing and a limiting strip structure on the upper housing with the limiting strips on the mounting grooved rail of the bus housing, sothat the plug-in communication of the power distribution module at any position can be realized, thereby bringing convenience to a user for use. Through the cooperative use of a socket interface, anindicating lamp assembly,