The invention discloses a deep hole inner pipe in-place alarming rope coring drilling tool and a pressure detection system used by the deep hole inner pipe in-place alarming rope coring drilling tool. A valve block is designed between a mud water-inlet hole and a mud water-outlet hole, when an inner pipe is in place, a suspension ring is in contact with a base ring, a mud circulating path is blocked, mud enters the water-inlet hole, first elastic calipers are arranged on the lower portion of the valve block, when the valve block is ejected to be open, the first elastic calipers are opened and clamped at the lower bottom of the elastic clamping recycling base in the middle of the valve body, meanwhile, the resetting rod on the lower portion of the first elastic calipers is clamped in the water-outlet hole, the valve block is kept in the opened state after being ejected to be open and does not reset during the drilling process, and during the process, after the pumping pressure changes transiently in 2 MPa and returns to a normal value, and the matched pressure monitoring system detects the change of the pumping pressure and gives out an alarm. The first elastic calipers are clamped at the lower bottom face of the elastic clamping base in the middle of the valve body, so that the valve block is always kept in an opened state during the drilling process. After the inner pipe is lifted to the ground, a cranked lever is ejected out from the water-outlet hole through tools, the first elastic calipers are closed, the valve block resets, the inner pipe in-place alarming during the deep hole drilling can be achieved, and therefore drilling auxiliary time is reduced.