The invention provides a multifunctional safety lifter for 
house building construction, which comprises a base, a support column, a top plate, a support frame, a lifting mechanism, an adjustable reinforced connecting 
column structure, a liftable buffer storage box structure, an adjustable support lap plate structure, a shielding protective filling cover structure, a support wheel, a U-shaped frame, a guide wheel, a steel 
wire rope, a connecting ring and a connecting frame, the supporting columns are connected to the four corners of the upper end of the base through bolts correspondingly, and the upper ends of the supporting columns are connected to the four corners of the lower end of the top plate through bolts correspondingly. The protective cover, the sliding hole, the sliding plate, the storage box, the dustproof cover, the output 
pipe, the top plate and the lifting mechanism are arranged in a matched mode, 
grease can fall to the proper position of the upper end of the lifting mechanism through the output 
pipe by means of the weight of the 
grease and vibration of the device during working in the using process, and automatic 
grease injection work can be conveniently achieved in the using process.