A plug-in controller for a pallet truck including a controller box, a control unit and a controller base. The control unit is enclosed by the controller box and a lower end of the controller box has a receptacle, while the controller base includes a raised socket. The controller box receptacle receives the raised socket of the controller base and a controller cable plug-in header and a controller signal line plug-in header provided by the receptacle engage and connect to a respective controller cable plug-in header and a controller signal line plug-in header provided by the controller base.