I want to know how much cost of Portugal work...

To obtain a work visa in Portugal, you must obtain a work contract, and then go to the Embassy of Portugal in the country where you reside, and apply for a visa,
The application shall be accompanied by the following documents:
1) Copy of a valid passport for at least six months 
2) Two photographs with the same specifications of passport photo with white background for each
3) booking flight
4) Copy of the contract of employment or letter of employment

To inquire about visa fees, you can contact the embassy through the following link:

e-mbportugal