Car coupler uncoupling device and car coupler

The invention provides a car coupler which comprises a coupler head, a coupler knuckle and an uncoupling device. The hook head comprises a multi-side hook head wall plate, a hook head cavity is formed by the multi-side hook head wall plate, the hook tongue is arranged in the hook head cavity, the first end of a handle of the unhooking device is connected to the hook tongue, and the second end of the handle of the unhooking device extends out of the hook head cavity through a groove hole structure in the hook head side wall plate; the handle can move in the extending direction of the groove hole structure so as to drive the coupler knuckle to rotate. A fixing plate of the unhooking device is installed on a hook head wall plate and located above a hook head groove hole structure, part of the plate face extends out of a hook head, a first plate hole is formed in the fixing plate, and the first plate hole is formed in the plate face, located on the outer side of the hook head, of the fixing plate. The handle driv