The utility model relates to a well cementing sliding sleeve device, which overcomes the defect that the sliding sleeve of the prior well cementing sliding sleeve can not be switched according to theoperation requirements due to the deformation caused by the deformation of the well shaft. A fixed pipe string (32) includes an upper joint (31), a jacket (30) and a spherical base which are fixedly connected with each other in sequence from top to bottom; a radial cementing hole (27) is formed at the middle part of the jacket (30); the sliding sleeve (28) is fixedly mounted in the inner hole of the fixed pipe string (32) through a radial-mounted shear pin (29); a radial communication hole (26) is formed on the sliding sleeve (28); the sliding sleeve (28) can slide up and down along inner holeof the upper joint (31), the jacket (30) and the spherical base (22) of the fixed pipe string (32); and an annular stage (24) is formed in the inner hole of the sliding sleeve (28). The well cementing sliding sleeve device has the advantages of simple structure, convenient operation, shortened construction period and lowered production cost, and can prevent the sliding sleeve from sliding out ofcontrol due to the accident broken of the pin when the pipe string is lowered.