The invention relates to a controlling method for coil contacting of a hot rolling coiling machine unloading trolley. The controlling method comprises the following steps that 1), a calibrating procedure is made to calculate the speed of low-speed rising-and-falling and high-speed rising of an unloading trolley; 2), when strip steel is coiled, the unloading trolley firstly pre-rises to a pre-rising position, of 300mm-500mm under the maximum coiling diameter of a coiling machine for waiting; 3) when the time that the strip steel tail reaches the coiling machine is less than the time required bythe unloading trolley rising from the pre-rising position to contact a steel coil at a low speed, the unloading trolley rises in a low speed to contact the steel coil; and 4), after the steel coil contacts with the unloading trolley and is discharged from the coiling machine, the unloading trolley falls down at a low speed, when the time that the unloading trolley falls down is more than the timethat the unloading trolley from the coil contacting position reaches to a coil unloading fixing beam, the unloading trolley returns to the lowest position at a high speed, and all unloading actions are completed. According to the controlling method, the unloading trolley can stably connect with the steel coil, and the accident rate is reduced.