Supporting and screwing device for in-reactor instrument grillwork assembly

The utility model provides a supporting and screwing device for an in-reactor instrument grillwork assembly. The supporting and screwing device for the in-pile instrument grillwork assembly comprises a temporary supporting component and a screwing device body, the temporary supporting component comprises a supporting plate and a temporary supporting block, and the supporting plate penetrates through a locking window in an IGA lifting tool lifting pipe and abuts against the side edge of the locking window; the temporary supporting block is arranged below the supporting plate and abuts against the supporting plate so that the IGA lifting tool lifting pipe can be supported on a reactor internal lifting tool operation platform. And the screwing device is inserted into the IGA lifting appliance lifting pipe to operate the guide extension column. According to the utility model, the processing difficulty of the problem that the guide extension column is not screwed in place is reduced, the overall working efficiency