The invention discloses a collision protection mechanism applied to an industrial robot and mainly aims to solve the problem that an existing collision protection mechanism of the industrial robot isrelatively narrow in application range. The collision protection mechanism applied to the industrial robot comprises a mechanical arm and colliding plates; the colliding plates are arranged at the twosides of the mechanical arm; the mechanical arm is provided with a first sliding rail; the first sliding rail is rotationally connected with a first connecting part; the first connecting part is rotationally connected with the first sliding rail through a first rotating shaft; the first connecting part is inserted into a second connecting part; the two sides of the first connecting part are eachprovided with a second connecting seat; the second connecting seats are rotationally connected with the first connecting seat on a slider through first connecting rods; the slider is slidably connected with a second sliding rail arranged on the mechanical arm; the colliding plate is provided with a protection mechanism; the protection mechanism is a first protection mechanism or a second protection mechanism; and the applicability of the protection mechanism is improved.