The invention provides an embedded one-way valve. The embedded one-way valve is assembled and connected with a main machine and comprises a spring seat, a spring, a sealing ball, a valve body and a guide sleeve, the spring seat is in a cup body shape, the opening of the spring seat is opened outwards, and a through hole is formed in the cup bottom surface of the spring seat; and the valve body isthe hollow cylinder body, the inner wall of the valve body comprises a step part protruding inwards in a radial mode, the spring seat is fixedly connected with one end of the valve body, after connecting, a storing space is formed by the spring seat and the step part, the spring and the sealing ball are placed in the storing space, the sealing ball is propped against the step part under the tension action of the spring, the side, facing the sealing ball, of the step part is provided with a conical surface, the guide sleeve is of a hollow cylinder and is in riveting connection with the other end of the valve body. The one-way valve has the simple and compact structure, is designed into a built-in type, placed in the main machine, and improves the assembly speed of the main machine.