The invention provides a public bicycle parking system without piles. The public bicycle parking system without piles comprises a bicycle information collector arranged on a bicycle: a positioning unit for collecting and sending the position information of the bicycle; a parking guiding unit for displaying the target bicycle body direction information of the bicycle; a server; a positioning confirmation unit configured to receive the position information, and obtain the road information of a road where the bicycle is located according to the position information, wherein the road information includes road type information, road width information, road direction information, and road condition information; and a direction adjustment unit for obtaining and transmitting the target bicycle body direction information based on the road information. The public bicycle parking system without piles defines the parking angle of the bicycle according to the road information of the road where thebicycle is located, on one hand, ensures the smoothness of the road as much as possible, and on the other hand, optimizes the parking position of the bicycle.