The invention relates to an automatic sample unloading mechanical hand device for a tensile test machine; the automatic sample unloading mechanical hand device includes an upper sample unloading rotation cylinder (1), an upper sample unloading mechanical hand (2), a lower sample unloading rotation cylinder (3), a lower sample unloading mechanical hand (4), a funnel (5), a turnover plate (6) and a sample collector (7); the upper sample unloading mechanical hand is connected onto the upper sample unloading rotation cylinder through a rotary arm (8); the lower sample unloading mechanical hand is connected onto the lower sample unloading rotation cylinder through a rotary arm; the funnel (5) is located below the lower sample unloading mechanical hand; the turnover plate is connected onto a connection plate (5a) at the lower end of the funnel through a cylinder (9); a longitudinal separation plate (7a) is arranged at the middle part of the sample collector. Different samples can be taken out from an upper clamp and a lower clamp of the tensile test machine and then are put into the corresponding sample collectors according to a computer control program, artificial screening work is replaced, manpower and material resources are saved, and the work efficiency is improved.