A telescopic lifting appliance comprises a main beam, two pairs of telescopic beams, a pair of end beams, a telescopic chain device, rotary locking devices and a plurality of guide rod devices. The two pairs of telescopic beams are respectively correspondingly arranged at two ends of the main beam; the end beams are respectively arranged at the end portions of the two pairs of telescopic beams; the end beams are provided with cavities; the telescopic chain device is arranged inside the main beam; the rotary locking devices are arranged inside the cavities of the end beams; and the guide rod devices are arranged on the front sides and the rear sides of the pair of end beams. As the telescopic lifting appliance is provided with a chain wheel driving device, the telescopic lifting appliance is capable of controlling the rotational speed of chains and rapidly braking under emergency situations to ensure use safety. As the telescopic lifting appliance is provided with the rotary locking devices, the telescopic lifting appliance is capable of ensuring that an engine is locked after stopping at the correct position of each terminal position, simultaneously being manually operated and realizing safe and reliable use. Moreover, the telescopic lifting appliance is low in cost, easy in operation and wide in application range.