Explosion-proof rail transit locomotive capacitor

The invention relates to an explosion-proof rail transit locomotive capacitor, which comprises a base, a buffer mechanism, a third heat dissipation mechanism and a body, and is characterized in that the third heat dissipation mechanism is detachably connected to the periphery of the body, the third heat dissipation mechanism comprises a protection shell, a heat dissipation filler and a heat conduction rod, an inner groove is formed in the protection shell, and the heat dissipation filler is filled in the inner groove. The buffer mechanism can provide a buffer effect on the body, the body is prevented from being in a hard contact shaking state, components in the body are prevented from being damaged, one end of the heat conduction rod makes contact with the body and the other end of the heat conduction rod makes contact with the heat dissipation filler under the action of the heat conduction rod while buffering is conducted, heat generated on the body can be conducted out through the heat conduction rod and th