The utility model provides a two-stage cementer free from drilling, and belongs to the field of two-stage well cementation of sleeves of deep wells and ultradeep wells. The two-stage cementer comprises a two-stage hoop (101), a closing plug (102) and a lower rubber plug (103). After the two-stage well cementation is completed by utilizing the cementer, upper and lower sliding bushes in the two-stage hoop and the closing plug are connected together and automatically fall into the bottom of a well through pressure, and a small-sized drilling rod and a drilling bit are not required to be repeatedly placed after the well completion; the cementer can be used to open circulating openings under the hydraulic and mechanical actions, at the same time, the circulating openings can be guaranteed to be opened and closed smoothly; in addition, any one sealing ring in the two-stage hoop can be detected accurately whether damaged or not; and moreover, the two-stage hoop body and an inner sleeve has relatively thicker effective thickness, so that the tensile strength, the internal pressure and external pressure resistance of the two-stage hoop are improved.