A heat recovery device and an alignment film curing system. The heat recovery device can be provided outside a heating device, and it includes a first recovery unit including a first chamber and a first communicating pipe that is provided in the first chamber. The first chamber has a first gas inlet and first gas outlet, a first waste gas inlet and a first waste gas outlet, and the first communicating pipe is arranged in a winding way and connected between the first gas inlet and the first gas outlet in an enclosed way. The first gas inlet is connected to a gas supply pipe of the heating device, the first gas outlet is connected to an intake pipe of the heating device, the first waste gas inlet is connected to an exhaust pipe of the heating device, and the first waste gas outlet is configured to discharge waste gas.