The invention relates to a cementing casing or tubing sliding sleeve with unlimited sections and clusters, comprising an upper joint, a reducing sleeve, a sliding sleeve body and a lower joint, the upper joint is connected with the reducing sleeve, and the reducing sleeve is connected with the sliding sleeve. The main body is connected, the sliding sleeve body is connected with the lower joint, and the inner wall of the reducing tube is provided with grooves to form a reducing area on the inner wall of the reducing tube, and an elastic tube is installed on the reducing area; the middle part of the sliding sleeve body is evenly distributed along the circumferential direction with multiple fracturing port, the inner wall of the sliding sleeve body is provided with an expanding area, the expanding area is located below the fracturing port, the sliding sleeve body is covered with an inner sliding sleeve, and a C ring is installed at the lower end of the sliding sleeve body. , gas field vertical wells, horizontal wells with unlimited sections and infinite clusters between sections, and the full diameter of the wellbore before fracturing, no throttling of sliding sleeves and ball seats, large construction displacement, can greatly improve the fracturing effect, increase the unit Well production: after fracturing, the ball and C ring made of soluble materials are dissolved or drilled off, and the wellbore becomes full diameter again, which is convenient for later production and operation.