A fishing assisting tool for a light falling object in a well comprises an upper connector (1), a shell (2), a seal ring (3), a seal ring (6), a pressure bearing head (4), a piston (5), a spring (7), a feather key (8), a stop collar (9) and a lower connector (10). The fishing assisting tool for the light falling object in the well is cylindrical, the lower connector (10) and the piston (5) are of an integrated structure and are installed on the lower portion of a middle channel (B) of the shell (2) through the feather key (8) and the stop collar (9), the spring (7) is installed between the piston (5) and the stop collar (9), the pressure bearing head (4) is installed at the position, above the piston (5), of the upper portion of the middle channel (B), and the upper end of the shell (2) is in threaded connection with the upper connector (1). The fishing assisting tool is suitable for fishing up the light falling object in the oil field well repair process, repeated fishing is avoided, labor intensity of operators is relieved, and the falling object or a fishing tool is prevented from being damaged.