This is a GW 43-11 Chaos Space Marines: Rhino 

This set contains everything you need to build one Chaos Rhino. You’ll have the option of equipping yours with a variety of weapons – including a combi-weapon or combi-bolter. This kit also comes with an upgrade sprue bedecked with spikes, railings and Chaos symbols, with plenty of spares for customising the rest of your Chaos models.