Spring type float collar capable of avoiding accumulation of mud impurities

The utility model discloses a spring type float collar capable of avoiding accumulation of mud impurities, which belongs to the technical field of spring type float collars and comprises a float collar body, a first pipe sleeve and a second pipe sleeve are mounted in the float collar body in a threaded manner, and a first outer pipe and a second outer pipe are mounted in the first pipe sleeve and the second pipe sleeve in an inserted and embedded manner. According to the utility model, the anti-backflow assembly is arranged inside, so that the pressure on the anti-backflow assembly can be increased during discharging during use, at the moment, the top check block can descend, cement can automatically flow out, and when no cement is applied, the top check block can automatically close the discharging pipe, so that the situation that the added cement flows back due to pressure change is effectively prevented; the float collar body and the pipe sleeve are designed to be in threaded connection, in the outer pipe