The invention relates to a low-cost fireproof power cable, which comprises three structurally identical cable cores arranged in parallel. Each cable core is composed of a conductor, and an insulating layer is wrapped outside the conductor. After the three cable cores are arranged in parallel, gaps among the cable cores are filled with a filling layer. A belting layer is wrapped outside the filling layer. A high-temperature-resistant and fireproof plastic sheath is sleeved outside the belting layer. The insulating layer is particularly made of ceramized polymer composite fireproof silicone rubber. The plastic sheath is particularly made of low-smoke and halogen-free polyolefin. According to the technical scheme of the invention, the ceramized polymer composite fireproof silicone rubber can effectively play the fireproof effect. Meanwhile, the low-cost fireproof power cable is simple in machining process, lower in cost and free of any extra equipment. Moreover, by means of the high-temperature-resistant and fireproof plastic sheath, the normal working period of the cable in the flame can be more effectively prolonged.