Slag waste heat recovery and vexed slag system that pressurizes are all, including the slag ladle tilting mechanism, the cylinder, exhaust -heat boiler, straight line cooler, vexed slag ladle, the slag ladle platform truck, vexed sediment pressurization cauldron and slagging -off machine, the slag ladle tilting mechanism can be tumbled the slag ladle that is equipped with the slag, the cylinder surface sets up the roller tooth that is spirally arranged, the cylinder lower part sets up the slag groove, set up the closed hood on the slag groove, slagging -off machine can transport the slag in the slag ladle after tumbling to the slag inslot, the discharge gate in slag groove is located the straight line cooler top. The utility model discloses an air is as the heat transferring medium. Firstfan insufflates the straight line cooler high temperature materials layer with the air, and the room temperature air passes the high temperature slag from bottom to top, and the air is heated, accomplishes first step heat transfer. Through the gaseous cylinder that gets into of straight line cooler heat transfer, gas passes the slag of stirring, is further heated, accomplishes the secondary heat transfer. High -temperature gas takes out through the second fan and causes exhaust -heat boiler to realize waste heat recovery.