The invention discloses an automatic detection device for trolley wheels, which relates to a detection device, and solves the problem that a situation that a trolley wheel is detached or derailed in severe environments can not be found in time. The automatic detection device comprises a support, a proximity switch is fixed at the tail end of the support, the proximity switch is connected with a PLC (programmable logic controller) system through a conductor, and the PLC system is also connected with an audible and visual alarm. The automatic detection device disclosed by the invention is low in cost and convenient to install, can be completely installed by using a shorter maintenance opportunity, and can implement the detection on the operating state of a trolley wheel; and if a situation that a trolley wheel is detached or derailed occurs, the situation can be detected accurately, therefore, the automatic detection device is an automation device for protecting devices such as sintering machines, circular coolers and the like.