I am taking UOB bank loan, can i engage HDB solicitor? The seller is taking HDB loan and engaged HDB solicitor.

The banker told that the seller's and buyer's solicator must not from the same firm.

No.

HDB solicitor is only for those take up HDB loan

This is the conveyancing Fee If HDB's solicitor is acting for you in the flat purchase

http://www.hdb.gov.sg/fi10/fi10321p.nsf/w/BuyResaleFlatCostLegal?OpenDocument

^Note :
i) If you are taking an HDB loan and the HDB's solicitor is acting for you in the mortgage of the flat to the HDB, the HDB will charge full scale fee as the HDB’s solicitor subject to a minimum fee of $20/- for 1- and 2-room flats and $40/- for other types of flats. In addition, the HDB will also charge one half of the scale fee as the mortgagor’s solicitor (subject to a minimum fee of $20/- for all flat types.)

ii) If you are taking a housing loan from a bank and the HDB's solicitor is acting for you in the mortgage of the flat to the bank, HDB will charge one half of the scale fee as the mortgagor’s solicitor (based on the loan amount from the Bank)

All fees will be rounded up to the next $1/-

hmm..

along I thought HDB lawyer is only for HDB loan.