The utility model provides a pedal device and helicopter of folding shrink relates to pedal technical field. The pedal device of folding shrink includes step box, tumbler, footboard, first pivot, second pivot, connecting axle and hook mechanism. The step box is used for connecting at the fuselage, and the one end of tumbler is articulated through first pivot and step box, and it is articulated with the one end of footboard that the other end of tumbler passes through the second pivot, connecting axle fixed connection on the surface of tumbler, hook mechanism fixed connection on the surface ofstep box, set up on the step box jagged, the connecting axle get into the breach can with the hook mechanism joint, touch hook mechanism and can make hook mechanism and connecting axle break away from. The helicopter is including the pedal device of above -mentioned folding shrink. Pedal device simple structure, the collapsible of folding shrink, save space.