The utility model provides a be used for pyrolysis coal gas heat exchanger mechanical contact formula coke cleaning oil device, restraints and sets up including the facial canal that is heated and restraints the pivot of both sides at the facial canal that is heated, and arranges in each is heated the facial canal and wash with the metal of the facial canal inner wall laminating of being heated, the metal wash and to link to each other with the pivot of both sides respectively through wire rope, install the driving gear that links to each other with the motor in the pivot of one side, install driven gear in the opposite side pivot, the driving gear passes through the chain with driven gear and links to each other, the motor drives initiative gear revolve during system coke cleaning oil, drives driven gear through the chain and rotates with the pivot, drives the metal and rinses and to restraint the inner wall with the facial canal that is heated and take place the relative slip and realize tar and clear up changeing epaxial wire rope through fixing, the utility model discloses a metal of contact washs a direct action the staiing of the facial canal internal surface that is heated, to have to clear away and stains thoroughly advantages such as noresidue at harvest time.