Does the consulting service contract need to pay stamp duty on the sales contract?

It depends on whether the essence of the contract is specified in the Provisional Regulations on Stamp Duty. You have to hand in the listed items, but you don't have to hand in the ones that aren't listed.

1. Purchase and sale contracts, processing contracts, construction project contracts, property leasing, cargo transportation, warehousing, loans, property insurance, technology contracts or documents of a contractual nature;

2. Documents certifying the transfer of property rights;

4. Rights and permits;

5. Other tax vouchers determined by the Ministry of Finance.