Electrocaloric effect (ECE) materials have garnered significant interest for their potential in creating more portable, compact cooling solutions and reducing greenhouse gas emissions. Enhancing both the temperature change ΔT and the temperature span Tspan of ECE materials remains a formidable challenge. The diverse and flexible local polarization in the high-entropy ferroelectric materials hold promise for addressing this issue. A series of high-entropy ferroelectric ceramics with composition (1-x)PbTiO3-xPb(Mg0.2Zn0.2Nb0.2Ta0.2W0.2)O3 has been synthesized using a solid-state reaction. As x increases, the crystal structure transitions towards a cubic phase, and the freezing temperature Tf decreases from 92 to 47 °C. There is a notable reduction in the coercive field, and the polarization reaches the maximum value of 32.07 μC/cm2 at x = 0.75. Utilizing the direct method, the samples with x = 0.725 and x = 0.75 achieve an optimal ΔT of 0.35 K and Tspan of 123 K at an electric field of 20 kV/cm, respectively. The ΔT and Tspan of the sample with x = 0.75 observed by the indirect method surpass 1 K and 100 K, respectively, at an electric field of 55 kV/cm. This study highlights the potential of employing a high-entropy approach to achieve superior ECE performance, paving the way for the development of advanced cooling technologies.