Inspection well safety detection system and control method and detection equipment thereof

The invention discloses an inspection well safety detection system and a control method and detection equipment thereof. The control method comprises the steps that the detection equipment is controlled to detect the spacing distance h1 between the liquid level in an inspection well and the lower end face of the detection equipment at any moment; the initial spacing distance h0 between the liquid level in the inspection well and the lower end face of the detection equipment when the detection equipment is installed in the inspection well is obtained; according to the initial spacing distance h0 and the spacing distance h1, the accumulated water liquid level height variation delta h1 between the liquid level in the inspection well and the lower end face of the detection equipment is obtained; the accumulated water hidden danger value S1 of the inspection well is obtained according to the accumulated water liquid level height variation delta h1; and sending an inspection well ponding warning to the user accordi