A rotor compressor, comprising: a cylinder block which comprises a cylinder block body, a front end cover and a rear end cover which are attached to a front end surface and a rear end surface of said cylinder block body respectively, said cylinder block body and said front and rear end covers defining an inner chamber; an eccentric rotor assembly fitted in the inner chamber of the cylinder block, the eccentric rotor assembly comprising a cylindrical rotor and a bush which is rotationally fitted over the cylindrical rotor, the bush contacting an inner wall of the cylinder block so as to form an axially extending sealing region; a shaft, said cylindrical rotor being mounted on the shaft and being rotatable therewith; separating means for separating an axially extending sealed chamber into an induction chamber and an exhaustion chamber, said axially extending sealed chamber being formed between the outer circumferential surface of the eccentric rotor assembly and the inner wall surface of the cylinder block, said induction chamber and said exhaustion chamber communicating with an inlet and an outlet respectively; wherein said separating means comprising: a separator plate which is provided with a pivot shaft at an end opposite to the eccentric rotor assembly, said cylinder block body being formed with an axially extending hole which opens to the inner chamber, said pivot shaft being fitted in the hole and being rotatably supported by the hole so that said separator plate can rotate in a predetermined range; one of the separator plate and the bush being provided with a contact member, the contact member comprising an axially extending cylindrical surface, and the other one of the separator plate and the bush being formed with an axially extending circular arc slot, said cylindrical surface being positioned in the circular arc slot and making a sealing contact with the circular arc slot, characterised in that said contact member is connected with said other one of the separator plate and the bush by means of a separate connecting member, the connection provided by the connecting member allowing the separator plate and the bush to rotate relative to each other with a central axis of the cylindrical surface as an axis. a cylinder block which comprises a cylinder block body, a front end cover and a rear end cover which are attached to a front end surface and a rear end surface of said cylinder block body respectively, said cylinder block body and said front and rear end covers defining an inner chamber; an eccentric rotor assembly fitted in the inner chamber of the cylinder block, the eccentric rotor assembly comprising a cylindrical rotor and a bush which is rotationally fitted over the cylindrical rotor, the bush contacting an inner wall of the cylinder block so as to form an axially extending sealing region; a shaft, said cylindrical rotor being mounted on the shaft and being rotatable therewith; separating means for separating an axially extending sealed chamber into an induction chamber and an exhaustion chamber, said axially extending sealed chamber being formed between the outer circumferential surface of the eccentric rotor assembly and the inner wall surface of the cylinder block, said induction chamber and said exhaustion chamber communicating with an inlet and an outlet respectively; a separator plate which is provided with a pivot shaft at an end opposite to the eccentric rotor assembly, said cylinder block body being formed with an axially extending hole which opens to the inner chamber, said pivot shaft being fitted in the hole and being rotatably supported by the hole so that said separator plate can rotate in a predetermined range; one of the separator plate and the bush being provided with a contact member, the contact member comprising an axially extending cylindrical surface, and the other one of the separator plate and the bush being formed with an axially extending circular arc slot, said cylindrical surface being positioned in the circular arc slot and making a sealing contact with the circular arc slot, characterised in that said contact member is connected with said other one of the separator plate and the bush by means of a separate connecting member, the connection provided by the connecting member allowing the separator plate and the bush to rotate relative to each other with a central axis of the cylindrical surface as an axis.