Pedal bicycle

The utility model discloses a directly pedaling type bicycle. A middle shaft and an arcuate guide way are arranged on a bicycle frame of the bicycle; a supporting frame for foot pedals is connected with the arcuate guide way through a manual positioner; two big chain disks, two small chain disks and two bevel gears are arranged on the middle shaft; a chain is arranged on the supporting frame for foot pedals; the chain is sheathed on the big chain disks and is connected with a foot pedal. On the basis that the utility model sufficiently exerts the force efficiency, the utility model has the advantages of simple structure and easy use. When the utility model is used, the foot pedals are pedalled from top to bottom, causing the bicycle to advance; a rider can freely adjust the angle of the supporting frame for foot pedals through pressing the manual positioner, so that the position of most labour saving and most comfort can be achieved.