The invention relates to a packing type staged cement injector which is mainly formed by connecting a cement injector body and an out-of-tube packer. The out-of-tube packer comprises a packing sleeve,a lower sliding casing arranged outside the packing sleeve, a slips mechanism, a packing mechanism and a setting-hanging sliding casing arranged in the packing sleeve and matched with the lower sliding casing in a linked mode, and the cement injector body comprises a main body, an upper sliding casing, a closing sliding casing, an opening sliding casing, a limiting sliding casing, an opening rubber plug and a closing rubber plug. The packing type staged cement injector can be used for staged deep-well cementing operation, after first-stage cementing is completed and the corresponding rubber plug is applied to build the pressure of a setting tube outer packer, a circulating hole is opened for secondary cementing, and finally the circulating hole is closed, so that staged cementing operation and annulus mechanical sealing are achieved, the problem that annulus leakage is caused due to the fact that annulus mechanical sealing is hard to achieve during special operation such as deep wellcementing and staged cementing is solved, and the leakage risk during staged cementing of deep wells and long well sections is lowered.