An angle adjustment device for a lighting softbox includes an operating device (10), a first connecting rod (20), a second connecting rod (30), and a control device (40) connected in series. The first / second connecting rod (20, 30) has a first / second outer tube (21, 31), a first / second inner tube (22, 32), and a first / second inner rod (23, 33). One end of the first / second inner tube (22, 32) near the operating device (10) has a first / second non-circular mounting base (24, 34), and the other end of the first inner tube (22) away from the operating device (10) has a clamping mounting base (25). The controlled device (40) is provided with a rotating part (41), an outer tube mounting base (44), and a plurality of screw positioning beads (45).The plurality of screw positioning beads (45) surrounds the fixing base of the outer tube (44) and passes through the fixing base of the outer tube (44) and the second outer tube (31), and the plurality of screw positioning beads (45) rests against the rotating part (41).