The invention discloses a solid-reaction method for preparing a flower-shaped nickel cobalt sulfide nanosphere in-situ electrode. The solid-reaction method specifically comprises the following steps:dissolving cobalt chloride, nickel chloride and thiourea into ethanol; dripping the preparation solution on the surface of a substrate for coating; then annealing in an inert atmosphere at 350 to 600DEG C to obtain the product. Each flower-shaped nickel cobalt sulfide nanosphere prepared by the solid-reaction method has the size of 200 to 300nm and is composed of a nano-rod and a nano-sheet. A counter electrode, which is used as a dyestuff sensitized solar cell, has very high electrocatalytic activity.