The invention relates to a directly-inserted quick connector used for solving the problem that a plugging element is easy to fail or the chucking force is insufficient. The directly-inserted quick connector comprises a connector body, an end cover and a lining positioned in the connector body. A sealing ring, a supporting pad, a chucking element and a pressing sleeve are sequentially arranged between the lining and the connector body. After improvement, the chucking element consists of a snap ring and spring rings; the snap ring consists of two split semi-rings; spring grooves opposite to each other are respectively arranged outside the semi-rings; the spring rings are positioned in the spring grooves; one side of the snap ring is provided with an inner conical surface and an outer conical surface; a chamfered-teeth bayonet is formed by the inner conical surface and an inner bevel adjacent to the inner conical surface. The directly-inserted quick connector adopts a chucking element structure formed by combining the two semi-rings with the spring rings, thereby effectively overcoming the defects that the performance after repeated use is poor and the chucking force is insufficient due to the lack of elasticity in a chucking structure. In addition, the lining and the connector body are fixedly connected and assembled by welding, and, compared with interference fit assembly, the fixed connection assembly by welding can lead to more reliable connection and good centering performance.