The invention discloses an elevator lift car sill device, which comprises a sill body, wherein two concave door chutes are arranged between a left narrow plane and a wide right plane on the sill body; one side of the left plane is downwards bent to form an inwards-inclined left side surface; one side of the right plane is downwards bent to form an inwards-inclined right side surface; the left side surface is upwards bent to form a left side horizontal plane; the right side surface is upwards bent to form a right side horizontal plane; the left side horizontal plane and the right side horizontal plane are positioned on the same horizontal position; the right side horizontal plane is provided with a plurality of threaded holes; the sill body is fixedly connected with a lift car body by bolts and the threaded holes. Since the elevator lift car sill device adopts a double-concave-door-chute structure and a stainless steel structure, the elevator lift car sill device is more suitable for a double-folding-door elevator, the strength and the durability of the sill device are guaranteed, and the elevator lift car sill device has the advantages of small possibility of deforming, simple integral structure and convenience in manufacture, installation, maintenance and preserving.