An electrothermal composition and electrothermal textiles are provided. The electrothermal composition includes a polyurethane and a plurality of metal nanomaterials. The polyurethane has repeating unit of Formula (I): wherein R1 is R2 is R3 is R4 is R5 is C1-4 alkylene group, R6 is C2-6 alkylene group, R7 is C2-6 alkylene group, R8 is C1-4 alkylene group, X is R9 is C2-6 alkylene group, a is 1 to 100, b is 0 to 100, and a≥b. The polyurethane has dynamic viscosity of 1000 cP to 5000 cP at 25° C.