The invention discloses an electric vehicle battery quick change device, further discloses an electric vehicle, and further discloses an electric vehicle battery quick change method. The electric vehicle battery quick change device comprises a fixing plate, a first sliding block and a second sliding block. The fixing plate is provided with a perforation, a first track and a second track communicating with the first track. The first sliding block is disposed in the first track, the first sliding block can slide in the first track, the second sliding block is disposed in the second track, and the second sliding block can slide in the second track. The first sliding block is connected with the second sliding block through a connecting rod, and the first sliding block and the second sliding block are linked to move. The perforation is used for being connected with a vehicle body longitudinal beam matching block. The electric vehicle battery quick change device adopts a pure mechanical motion mechanism, realizes fixing and locking of the mechanism by the sliding block movement, and has a good locking effect; the electric vehicle battery quick change device is in interference fit with avehicle body to facilitate maintenance, a power part of the quick change device is located on a battery changing tray, vehicle body connecting equipment is simple, and the overall lightweight effect is good; and the installation operation is simple and fast, the disassembly is convenient, and the firmness is high and the cost is low.