The utility model relates to the field of riding helmets, in particular to a riding helmet convenient to adjust, which comprises a helmet shell, a foaming body used for buffering and damping is arranged on the inner wall of the helmet shell, a lining is arranged on the inner wall of the foaming body, an adjusting component is arranged on the inner wall of the lining, and the adjusting component comprises a left support and a right support. The left support and the right support are both provided with adjusting racks, the adjusting racks of the left support and the right support are oppositely arranged, the ends, away from the racks, of the left support and the right support are connected through a fixed installation block, an adjusting box is arranged on the edge of the rear end of the helmet shell, and two parallel sliding grooves are formed in the adjusting box. The adjusting racks of the left support and the right support are inserted into the two sliding grooves respectively, an adjusting gear is arranged between the two sliding grooves, a rotating shaft is arranged in the middle of the adjusting gear, an adjusting knob is arranged at the end, away from the adjusting gear, of the rotating shaft and extends to the surface of the helmet shell, and a rider can adjust according to the size of the head of the rider. The use is more convenient.