The invention discloses a safety gate of a petroleum drilling machine. The safety gate comprises a drilling platform, a fence on the drilling platform, a gate frame inlaid in the fence, and a gate body in the gate frame; the gate frame and the gate body are connected through a connecting piece, and a motor is connected to the connecting piece; the motor is connected with a controller located in acontrol box on the outer side of the gate body; a delayer, a signal converter and an AD converter are further connected to the controller; the signal converter is connected with a facial recognizer located on the inner wall of the fence; the AD converter is connected with an infrared sensor located in the control box; and an electronic lock is arranged at a gate edge of the gate body and connectedwith the controller. The connecting piece is arranged, the controller controls the connecting piece to stretch out and draw back, thus opening and closing states of the gate body are ensured, it is ensured that workers are located in a safe working environment, safety of the workers is ensured to a large extent, the workers feel more relieved during working, and meanwhile the operating efficiencycan be improved.