The present invention provides a porous zirconium powder having improved heat resistance of total pore volume, and a simple production method thereof. More specifically, the present invention provides: (1) a porous zirconium powder in which total pore volume following heat treatment for three hours at 1000°C is at least 0.75 ml/g, and total volume of pores having a diameter of 10 to 100 nm following heat treatment for three hours at 1000°C is at least 30% of the total pore volume, and (2) a production method of a porous zirconia powder comprising: forming a basic zirconium sulfate by adding a sulfating agent to a zirconium salt solution; forming zirconium hydroxide by neutralizing the basic zirconium sulfate; and heat-treating the zirconium hydroxide, wherein, when adding the sulfating agent to the zirconium salt solution, the sulfating agent is added to the zirconium salt solution having a temperature of 100°C or higher.