The utility model relates to an experimental mechanics field of metal tubular product, concretely relates to online calibration device of large -tonnage oil well pipe combined loading test bench loadsensor. It is found the measuring force device that bears who becomes to have the switching -over function including T type joint, axle sleeve, spacer sleeve, overcoat, force bearing ring, sensor pressure head, sensor, sensor bearing seat, slip parallel key, sliding sleeve, big silk braid, connecting rod by these parts, carry out the timing signal when needs to test bench load sensor, the utilitymodel discloses install the mounted position at the test bench sample, the T type connects to be buckled mother with test bench both ends respectively with the connecting rod and is connected, memberthrough wherein transmits the conversion, measures the test bench exerted draw to load value or press to load value, and the corresponding charge number that the data that obtain and the sensor of test bench own recorded makes bench run data measurement more accurate according to comparing and revising.