Objective Targeting at the deficiency of heat sealing time of the transverse sealing mechanism, a rotary reciprocating traverse type sealing mechanism for D shaped transverse sealing trajectory was put forward, and the motion characteristics of the transverse sealing mechanism was analyzed. Methods According to technological requirements of the traverse seal mechanism of packaging machine, a kinematics equation was proposed for the mechanism servo input. A simple model was built for the mechanism, and kinematics simulation was implemented using Adams software. Results Rotary reciprocating traverse seal mechanism could meet the preset requirements of the technology, and could effectively extend the transverse sealing time. Conclusion Rotary reciprocating traverse seal mechanism enriched the types of the transverse sealing mechanism, which to a certain extent solved the existing problems of rotary type sealing mechanism and reciprocating type traverse sealing mechanism.