Portable maintenance tool

The utility model relates to the technical field of urban rail vehicle maintenance tools, in particular to a portable maintenance tool. Comprising a handle assembly and a jaw assembly, the handle assembly comprises a handle body, anti-skid grooves are formed in the end faces of the two sides of the handle body, an interface groove is formed in the inner side of the front portion of the handle body, a threaded hole is formed in the inner side of the handle body, and the jaw assembly comprises an assembling rod, a second jaw, a third jaw, a dustproof cover and a threaded rod. One end of the assembling rod is connected with a first jaw, one end of the dustproof cover is connected with a sealing plug, and a threaded hole is formed in the inner side of the assembling rod. After the overturning cover is opened, the first jaw is taken out of the first clamping groove, then the assembling rod connected with the first jaw is inserted into the connector groove and assembled and connected through the threaded rod, then