The invention discloses an elastic fixing device for a cable of a machine room, and the device comprises a cylinder. The center of the cylinder is provided with a first circular hole, and six second circular holes are disposed in the peripheral direction of the first circular hole. The center of the cylinder is provided with a through and linear first crack, and two sides of the first crack are respectively provided with one L-shaped second crack. The device is made of ethylene propylene terpolymer. A user can directly enable a plurality of strands of cables to pass through the first circular hole or the second circular holes, and the wire harness is clamped through the first crack and the second crack. Because the device is made of ethylene propylene terpolymer, the device is good in elasticity, can be used for the storage of cables in different sizes, and greatly improves the tidiness of the wire harness of the machine room.