NOVELTY - The vehicle comprises an engine connected with an energy recycling device through a cooling water supply pipeline and a cooling water return water pipeline. The energy recycling device is connected with an air heat exchange working medium that is connected with an air supply pipe. The air supply pipe supplies air to a vehicle modular sludge drying device. The air return pipeline supplies returning air to the energy recycling device. An upper part of the air return pipe is provided with a cooling device and the working medium for dehumidification.    USE - Waste sludge drying vehicle.    DETAILED DESCRIPTION - The vehicle comprises an engine connected with an energy recycling device through a cooling water supply pipeline and a cooling water return water pipeline. The energy recycling device is connected with an air heat exchange working medium that is connected with an air supply pipe. The air supply pipe supplies air to a vehicle modular sludge drying device. The air return pipeline supplies returning air to the energy recycling device. An upper part of the air return pipe is provided with a cooling device and the working medium for dehumidification. The vehicle modular sludge drying device is provided with a tail gas pipe, a sludge feeding opening, an indirect drying tank, an indirect dryer, a direct drying tank and a sludge discharge hole. The tail gas pipe supplies engine tail gas into a dryer for preheating and preliminary drying the sludge. The engine is a water-cooling type engine having cooling water temperature of more than 90 degrees C. The direct drying box is in direct contact with the working medium including a belt, a disk and a drying device. The air return pipeline is connected with an upper auxiliary hot pump of the energy recycling device. An evaporator and a condenser are connected with the energy recycling device. The tail gas pipe passes the tail gas into the indirect dryer for pre-heating and preliminary drying process. The air pipe in the working medium passes air to the directly drying box. The working medium, the air return pipe, the cooling device and the energy recycling device form a closed loop. The drying box is divided into upper and lower parts, which are fixed with the indirectly drying box and a directly drying box. A spiral discharging device directly enters the drying box in a middle part of a clapboard.