Three-proofing POS (point of sales) machine support

The invention relates to the field of self-service payment devices, particularly to a three-proofing POS machine support. The three-proofing POS machine support comprises a fixed base plate, a flashing, a POS machine mounting case, a user list loading case and a process table loading case. The fixed base plate is fixedly adhered to the wall of a building; the flashing is fixed in the middle of the surface layer of the fixed base plate; the POS machine mounting case is mounted in the middle of the lower end of the fixed base plate; the user list loading case is mounted on the right of the POS machine mounting case; the process table loading case is mounted on the left of the POS machine mounting case. The three-proofing POS machine support facilitates public operation, meanwhile, well baffles sunshine and rainwater and avoids manual damage to a POS self-service terminal.