Fish top trimming overshot

The utility model provides a fish top trimming overshot which comprises an overshot body and a mandrel. The upper end of the overshot body is connected with an upper connector through inner threads, the mandrel is arranged in the overshot body in the vertical direction, the upper end of the mandrel is connected with the inner side face of the upper connector through outer threads, an annular guide portion is arranged on the inner side face of the overshot body in a protruding mode, a distance is reserved between the inner side face at the position close to the lower end of the mandrel, of the guide portion, and the outer side face of the mandrel, and an annular guide channel is formed between the inner side face of the guide portion and the outer side face of the mandrel. The upper end face of the guide portion and the inner side face of the overshot body are connected through a conical annular face, the inner diameter at the upper-end position of the conical annular face is larger than the inner diameter at the lower-end position of the conical annular face, at least one slide way is formed in the conical annular face from top to bottom in a concave mode, a slip capable of vertically sliding is embedded into the position of the slide way, the portion on the upper side of the guide portion, of the inner cavity of the overshot body, is an accommodating cavity communicated with the annular guide channel, and the portion on the lower side of the guide portion, of the inner cavity of the overshot body, is a guiding shoe portion. The fish top trimming overshot can salvage a tubular fish provided with an inner cavity deformable fish top in a well.