The invention relates to the field of bottle openers, in particular to a one-handed bottom opener. The one-handed bottle opener comprises a force applying part and a hook part, wherein the front end of the hook part is bent to form a hook, the rear end of the hook part is connected with the front end of the force applying part, a certain included angle is formed between the rear end of the hook part and the front end of the force applying part, and a finger hole and a finger pressing groove are formed in the rear end of the force applying part. The included angle between the hook part and the force applying part is larger than 90 degrees and smaller than 180 degrees. The lower edge of a bottle cap is hooked through the hook part, an index finger penetrates into the finger hole, a middle finger is pressed to the finger pressing groove, pressure is applied downwards, then the bottle cap can be pried, and one-handed bottle opening can be achieved. The one-handed bottle opener is simple in structure, convenient to use, small in size and convenient to carry.