Fire truck with function of automatically winding and unwinding belt

The invention discloses a fire truck with a function of automatically winding and unwinding a belt and belongs to the technical field of fire trucks. The fire truck comprises a truck main body, a belt winding and unwinding mechanism and a belt spreading mechanism, wherein the truck main body comprises a truck head, a power carriage and a belt storage carriage; the belt spreading mechanism is arranged on a carriage framework of the belt storage carriage and matched with the top of the power carriage; the belt winding and unwinding mechanism is arranged on the belt spreading mechanism and comprises a belt winding and unwinding truss, a conveyer belt driving roller, a conveyor belt driven roller, a conveyor belt, a driving roller power box, a belt clamping roller transmission box, a belt clamping device and a support arm locking device; the belt winding and unwinding truss comprises a first arm beam, a second arm beam and a support arm; the driving roller power box comprises a driving roller power box body and a conveyor belt driving roller driving motor; the belt clamping transmission box comprises a belt clamping roller transmission box body, driving and driven chain wheels and transmission chains; a power carriage top frame is arranged at the top of the power carriage; a first arm beam guard bar is fixed on one side of the first arm beam; a second arm beam guard bar is arranged on one side of the second arm beam. The driving safety of the fire truck is ensured.