Ballast injection formula deep -sea sediment acoustic characteristic normal position measuring device is including outer supporting mechanism, injection actuating mechanism and control measuring mechanism triplex, outer supporting mechanism includes polygon support frame and stand pipe by the bolt -up, injection actuating mechanism is including lifting by crane subassemblies such as head, guide bar, activity pressure disk, mounting flange, ballast lead and probe rod, the control measuring mechanism includes state monitor sensor subassembly, acoustic sensor subassembly, control measuring circuit assembly, whether there is the communication cable to be connected according to between this measuring device and the deck control platform, adopts the real time monitoring mode respectively and accomplish the measurement process from the molarity formula. Stability when obviously outer supporting mechanism has guaranteed that measuring device sits the end in the seabed, the configuration of stand pipe and guide bar make probe rod drive acoustic transducer more smoothly in the injection deposit, come automatic judgement and control acoustic characteristic in site measurement process based on measuring device in seabed state parameter's collection, the control measuring mechanism has good scalability.