The invention provides a contact force and pressure detection device on an arm supporting platform and a data analysis method. The device comprises slide rails, an arm support plate, pressure sensors, a support frame, control handles, miniature weighing sensors, micro sensors and tension sensors. The pressure sensors are mounted to the aluminium alloy slide rails through screw holes, and the other ends thereof are fixed to the arm support plate so as to measure the force applied by two arms. The device can carry out systematic and comprehensive evaluation, including qualitative and quantitative evaluation, on patients having balance dysfunction problems and carry out diagnostic assessment on dysfunction reasons.