The construction hoist adopts the most advanced technology at home and abroad, reasonable structure, simple operation, safe and reliable work, the use of high quality steel by CO2 gas protection welding. The machine is provided with a safety interlock device, various reliable and perfect, is provided with a switch, circuit breaker protection switch, and the upper and lower limit and limit switch and other advanced interlock switch, install the progressive type safety device, a safety hook. Its safety is fully in line with national standards.