The invention discloses a concreting system for a thin-walled cylindrical part and a precision casting formation method. The concreting system comprises a wax tree formed by welding a sprue cup, a straight sprue, a horizontal sprue, an inner sprue and a casting together in sequence, wherein the wax tree is coated with a mould case. The precision casting formation method comprises the following steps: forming the mould case without a parting surface, coating the mould case, preheating the mould case, smelting and pouring, cleaning the casting, performing heat treatment, and the like. The precision casting formation method can replace the conventional widely-applied centrifugal casting forming method, mother alloy can be remarkably saved, the yield can be remarkably improved, the harsh requirements on equipment, environment and personnel can be reduced, the processing amount can be reduced, the cost is only 60% of that of the centrifugal casting, and as Stellite neck bush is high in consumption and multiple in variety each year, very considerable economic benefits are achieved.