The invention relates to a frame type bed guardrail which is designed aiming at the technical problems of existing similar products that the safety structure is not good, and the assembling and utilization are relatively not convenient. The bed guardrail comprises movable pipes, vertical pipes, square pipes, fixed pipes and an apron, and is characterized in that the movable pipes are arranged above the fixed pipes of a square frame pipe rack; knob assemblies are arranged at the two ends of the movable pipes on one side of the square frame pipe rack respectively; the knob assemblies are connected with the square pipes through the vertical pipes; the vertical pipes are located on the outer sides of the square pipes; a limiting hole is formed in one side of each vertical pipe; springs and limiting sleeves of the knob assemblies are arranged in pipe connection parts; the two ends of the springs abut against rivets and the limiting sleeves respectively; knob sleeves are arranged at the outer diameters of the pipe connection parts; one section of opening outer thread and one section of locking outer thread are arranged at the outer diameter of each pipe connection part; and each rotary sleeve is internally provided with one section of inner thread. The movement of the rotary sleeve drives pins to move, and the inner threads of the rotary sleeves are connected with the outer threads of the pipe connection parts; and limiting bulges of the limiting sleeves are inserted into the limiting holes of the vertical pipes or are released from the limiting holes, and the movable pipes can move up and down along the vertical pipes.