Semitrailer bearing surface width adjusting device

The utility model provides a semitrailer bearing surface width adjusting device which is used in cooperation with a semitrailer and comprises a bearing mechanism, a width adjusting mechanism and a width adjusting mechanism. One end of the hand-cranking spiral telescopic rod is fixedly connected with the main bearing table, the other end of the hand-cranking spiral telescopic rod is fixedly connected with the auxiliary bearing table, and telescopic movement of the hand-cranking spiral telescopic rod is used for driving the auxiliary bearing table to be pulled out or retracted relative to the main bearing table; the limiting mechanism comprises a limiting bent plate and a limiting block, the limiting block is fixedly arranged on the hand-cranking spiral telescopic rod, one end of the limiting bent plate is fixedly connected with the main bearing table, and the other end of the limiting bent plate is opposite to or abuts against the limiting block in the telescopic movement process of the hand-cranking spiral te