The invention discloses a feeding device of lawn mower head shells. The feeding device of the lawn mower head shells comprises a machine frame installed on the ground. A shell position-changing mechanism, a shell five-station feeding mechanical arm, a shell discharging mechanism and two shell feeding mechanisms identical in structure are arranged on the machine frame. The two shell feeding mechanisms are symmetrically arranged on the two sides of the shell position-changing mechanism correspondingly. The shell five-station feeding mechanical arm is located above the two shell feeding mechanisms. The shell discharging mechanism is located above the shell position-changing mechanism and corresponds to the shell position-changing mechanism. In this way, the feeding device of the lawn mower head shells achieves mechanical automation through full-automatic control and can replace manual work to feed shells and greatly save operating time; and in addition, the occupied area of the feeding device is small, and conveying line bodies are quite convenient to arrange.