Taking demolition robot working device as research objective, MATLAB Robotics Toolbox was used to build its model, the Robotics Toolbox program was called in GUI, the kinematics simulation graphical user interface of the device was established. The platform can be used to simulate the forward kinematics and the inverse kinematics,to draw the working device’s envelope diagram of the whole work space and the work space with a particular attitude angle quickly, to pick up the coordinate values of a target point automatically in the work space by mouse and to calculate its inverse kinematics, to display the trajectory dynamically,etc. Simulation results show its effectiveness and practicality.