Metro vehicle rim lubricating device

The utility model discloses a metro vehicle rim lubricating device, and relates to the technical field of lubricating devices. A mounting plate is hinged to one side edge of the connecting base, an adjusting assembly is arranged between the mounting plate and the connecting base, a rectangular pipe is connected to the side, away from the adjusting assembly, of the mounting plate through a fixing assembly, a supporting plate is arranged on one inner side wall of the rectangular pipe, and a groove is formed in the side face, away from the side face connected with the rectangular pipe, of the supporting plate; a constant-force coil spring is arranged in the groove, one end of the constant-force coil spring is connected with one end of the groove, a lubricating block is inserted into one end of the rectangular pipe and is in sliding connection with the rectangular pipe, the lubricating block is attached to the unfolded face of the constant-force coil spring, a normally-closed switch is embedded in the groove, and