The present invention relates to a wheel driven spreader having an unloader which can be mounted or dismounted, and which thus requires no needs for an additional unloader to standby, but facilitates easy separation and movement installation of the unloader, and allows a safe pillar to be folded, causing no interference with the ground when spraying fertilizers. The present invention provides a wheel driven spreader having an unloader which is composed of: a main body frame equipped with wheels and connection devices, which can run by using the traction force from a tractor； a hopper which is installed on the top of the main body frame to store fertilizers and which can spread sterilizers by receiving the rotational force from the wheels and operating a mesh chain conveyor and a spreading plate； an unloading device frame fixed and mounted in the main body frame； a crane unit composed of an extendable boom which is vertically supported in the unloading device frame, allowing a rotation and a winch installed in the boom to wind wires； a safety pillar composed of a carriage which can be retracted into the unloading device frame by sliding over the main body frame and an extendable support held up by the carriage； and a hydraulic controller unit which controls the pressure of fluids supplied from the tractor in order to extend the crane boom and the safety pillar&prime；s supports and to control winch winding from the crane unit, and which allows mounting of stacking panels instead of the hoppers installed in the wheel driver spreader to carry items as a trailer if necessary.본 발명은 차륜구동식 살포기에 하역장치를 착탈 가능하게 부가하여 별도의 하역장치를 대기시킬 필요가 없을 뿐만 아니라 하역장치의 분리 및 이전 설치가 가능하고, 안전지주를 접을 수 있도록 하여 비료살포시에 지면과의 간섭이 전혀 발생하지 않도록 한 하역장치가 구비된 차륜구동식 살포기에 관한 것이다.이를 위해, 본 발명은 차륜 및 연결장치를 구비하여 트랙터로부터 견인력을 전달받아 주행 가능한 본체 프레임과； 상기 본체 프레임의 상부에 설치되어 비료를 적재 가능하며, 상기 차륜의 회전력을 전달받아 메시체인 컨베이어 및 살포판을 구동시켜 비료를 살포하는 호퍼와； 상기 본체 프레임상에 안착하여 고정 체결되는 하역장치 프레임과； 상기 하역장치 프레임에 회동 가능하게 직립 지지되어 길이 신축 가능한 붐과, 상기 붐에 마련되
