The utility model discloses an offshore drilling multi-parameter monitor which comprises a drill floor monitor, a first monitoring device, a second monitoring device, a drill floor data acquisition toolbox, a mud data acquisition toolbox, a combustible hydrogen sulphide gas data acquisition toolbox, a blowout prevention data acquisition toolbox and dozens of sensors installed on the spot and connected with the data acquisition toolboxes; all the data acquisition toolboxes perform data exchange respectively through a CAC bus; the first monitoring device comprises an industrial control computer and a wireless receiver, wherein the industrial control computer receives the data from the drill floor monitor through the wireless receiver; and the second monitoring device adopts a computer system connected to a local area network, and the first monitoring device performs data transmission with the second monitoring device through a local area network. The offshore drilling multi-parameter monitor can achieve comprehensive monitoring and processing to the engineering parameters, the mud parameters and the poisonous and explosive gas parameters during the drilling process as well as the parameters for a wellhead blowout preventor and a control device for the wellhead blowout preventor, thereby providing secure and accurate data for drilling.