The invention discloses an anti-collision device. The anti-collision device is mounted on a linear rail and driven by a power device to achieve collision avoidance between two oppositely moving objects. The anti-collision device is characterized by comprising a first anti-collision mechanism and a second anti-collision mechanism fixed onto the moving objects respectively. The anti-collision devicealso comprises a contact unit and a contact sensing unit, and when the moving objects move oppositely to be in contact, the contact sensing unit issues electric signals to control to power off the power device or brake the two moving objects; meanwhile, the anti-collision device comprises a first limiting contact block and a second limiting contact block, the spacing between the two limiting contact block is smaller than that between the two moving objects, so that the rigid contact between the two limiting contact blocks can ensure a safe distance between the two moving objects.