Protective frame for assembled door

The utility model discloses a protection frame for an assembly type door, every two adjacent right-angle frames of a first right-angle frame, a second right-angle frame, a third right-angle frame and a fourth right-angle frame are connected through a telescopic assembly, each telescopic assembly comprises a sliding rod and a fixed seat, and each fixed seat is fixed on one right-angle frame. The two sides of the sliding rod are slidably installed in the sliding grooves in the two adjacent right-angle frames through a plurality of pulleys, a plurality of through holes are evenly formed in the sliding rod, a threaded rod is installed in the fixing base in a threaded mode, and the position between the two adjacent right-angle frames is adjusted and fixed through the telescopic assembly. The first right-angle frame and the second right-angle frame are connected through an adjusting rod assembly, the third right-angle frame and the fourth right-angle frame are connected through an adjusting rod assembly, a protecti