diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index da73f07..6a29c5a 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -323,6 +323,7 @@ dependencies = [
  "tracing-appender",
  "tracing-error",
  "tracing-subscriber",
+ "urlencoding",
  "uuid",
  "yaserde",
 ]
@@ -5133,6 +5134,12 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "urlencoding"
+version = "2.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "daf8dba3b7eb870caf1ddeed7bc9d2a049f3cfdfae7cb521b087cc33ae4c49da"
+
 [[package]]
 name = "urlpattern"
 version = "0.3.0"
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index 501d0c0..d55dac9 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -61,6 +61,7 @@ md-5 = { version = "0.10.6" }
 rand = { version = "0.9.1" }
 base64 = { version = "0.22.1" }
 rayon = { version = "1.12.0" }
+urlencoding = { version = "2.1.3" }
 
 [profile.release]
 strip = true
diff --git a/src-tauri/src/bili_client.rs b/src-tauri/src/bili_client.rs
index f8361bb..40ea8fb 100644
--- a/src-tauri/src/bili_client.rs
+++ b/src-tauri/src/bili_client.rs
@@ -1098,7 +1098,12 @@ impl BiliClient {
 
     pub fn get_cookie(&self) -> String {
         let sessdata = self.app.get_config().read().sessdata.clone();
-        format!("SESSDATA={}", sessdata.trim_end_matches(';'))
+
+        let trimmed = sessdata.trim_end_matches(';');
+        let decoded = urlencoding::decode(trimmed).unwrap_or_else(|_| trimmed.into());
+        let encoded = urlencoding::encode(&decoded);
+
+        format!("SESSDATA={encoded}")
     }
 }