Automatically resetting buoy with radial slide block system

The invention discloses an-automatically resetting buoy with a radial slide block system. The buoy comprises a buoy body, an anchor chain and an anchor block. The radial slide block system is arranged at the center position of the upper end of the buoy body. Two vertical positioning sleeves are symmetrically arranged on the side face of the buoy body. Idler wheel carriers fixed to the upper end of the buoy body are arranged at the upper ends of the positioning sleeves respectively. Idler wheels are arranged on the wheel carriers. The radial slide block system comprises a bottom plate, at least three slide blocks, compression springs and guide wheels. The guide wheels are arranged on the bottom plate. The slide blocks are evenly distributed in the circumferential direction. The springs are located between the adjacent slide blocks. Slide block sleeves are arranged at the outer ends of the slide blocks. The length of the anchor chain can be automatically regulated, and therefore it is ensured that extreme situations such as anchor block leapfrogging, buoy body submerging or drifting can not happen to the buoy; and buoy breaking or knotting caused by the fixed mooring length can be avoided as well, and it is ensured that the buoy drifting and gyration radii are within the allowable range.