Mercedes, who swept to a drivers' and constructors' double in 2014, will unveil the F1 W06 Hybrid before track action commences at the Spanish circuit. Nico Rosberg will be tasked with driving duties on the first and third days of the test, with 2014 champion Lewis Hamilton taking over on the second and fourth days.
Toto Wolff, head of Mercedes-Benz Motorsport, said: "This is an exciting time of year as our collective efforts all come together in the new car.
"We know that we went into the winter with a target on our backs from the other teams - and we are certain that our rivals will be competitive from the opening race in Melbourne. So we have to focus on every detail if we want to build any advantage this year and that is what we have done.
"The workload this winter has been as great as ever. Everybody in Brackley, Brixworth and Stuttgart has put a great amount of effort into creating the latest Silver Arrow and I thank them for their efforts so far. We are excited to see how the car performs when it begins running."
Mercedes' 2014 car, the F1 W05 Hybrid, proved one of the most dominant machines in F1 history, racking up a record 16 victories and 11 one-two finishes over the course of the season.